Common Weakness Enumeration

CWE-290

Allowed

Authentication Bypass by Spoofing

Abstraction: Base · Status: Incomplete

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

525 vulnerabilities reference this CWE, most recent first.

CVE-2026-94197 (GCVE-0-2026-94197)

Vulnerability from cvelistv5 – Published: 2026-10-14 14:40 – Updated: 2026-10-15 16:43
VLAI
Title
NGINX Ingress Controller vulnerability
Summary
An authentication and authorization bypass vulnerability exists in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with the `ExternalAuth` policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method routing and method headers are forwarded unsanitized into the internal authentication subrequest (handled by the NGINX auth_request directive). As a result, an unauthenticated, remote attacker may spoof request attributes evaluated by the external authentication provider. Impact: This vulnerability may allow remote attackers unauthenticated access to protected paths. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 15:53 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
f5 CNA
References
Impacted products
Vendor Product Version
F5 NGINX Ingress Controller Affected: 5.5.0 , < 5.7.0 (custom)
Create a notification for this product.
Date Public
2026-10-14 14:00
Show details on NVD website

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CVE-2026-93629 (GCVE-0-2026-93629)

Vulnerability from cvelistv5 – Published: 2026-10-23 13:19 – Updated: 2026-10-28 19:51
VLAI
Title
Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar REQUEST Organizer Identity
Summary
An organizer authentication vulnerability in Zimbra Collaboration Suite (ZCS) allows an unauthenticated email sender to insert calendar invitations attributed to another user. The email delivery path permits external invitations but does not verify that the message sender is authorized to use the iCalendar ORGANIZER identity. When automatic invitation insertion is enabled, a crafted REQUEST component creates an event containing attacker-selected meeting details and reminders under a forged organizer without recipient interaction. No corresponding event is created in the claimed organizer's calendar. ZCS 10.1.16 and 10.1.21 are affected.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 18:23 UTC
CWE
  • CWE-290 - Authentication bypass by spoofing
Assigner
rapid7 CNA
Impacted products
Vendor Product Version
Zimbra Zimbra Collaboration Suite Affected: 0 , ≤ 10.1.21 (semver)
Create a notification for this product.
Date Public
2026-10-23 12:47
Show details on NVD website

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CVE-2026-93628 (GCVE-0-2026-93628)

Vulnerability from cvelistv5 – Published: 2026-10-23 13:18 – Updated: 2026-10-28 20:02
VLAI
Title
Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar REPLY Attendee Response
Summary
An attendee authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sender to forge another attendee's response to an existing meeting. Zimbra passes a null sender identity when processing iCalendar REPLY components, causing the attendee authorization filter to be skipped. An attacker who knows the meeting UID, organizer address and attendee address can send a non-outdated reply that changes the attendee's participation status in the organizer's calendar. The change occurs automatically during delivery without organizer or attendee interaction. ZCS 10.1.16 and 10.1.21 are affected.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 18:23 UTC
CWE
  • CWE-290 - Authentication bypass by spoofing
Assigner
rapid7 CNA
Impacted products
Vendor Product Version
Zimbra Zimbra Collaboration Suite Affected: 0 , ≤ 10.1.21 (semver)
Create a notification for this product.
Date Public
2026-10-23 12:46
Show details on NVD website

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CVE-2026-93627 (GCVE-0-2026-93627)

Vulnerability from cvelistv5 – Published: 2026-10-23 13:17 – Updated: 2026-10-28 20:02
VLAI
Title
Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar CANCEL/REQUEST Organizer
Summary
An organizer authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sender to cancel or modify an existing meeting in a recipient's calendar. Zimbra accepts iCalendar CANCEL and REQUEST components without verifying that the email sender is authorized to act as the supplied organizer. An attacker who knows the meeting UID and organizer address can supply a non-outdated sequence number to move the recipient's meeting to Trash or replace its details. Processing occurs automatically during email delivery without recipient interaction. ZCS 10.1.16 and 10.1.21 are affected.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 18:23 UTC
CWE
  • CWE-290 - Authentication bypass by spoofing
Assigner
rapid7 CNA
Impacted products
Vendor Product Version
Zimbra Zimbra Collaboration Suite Affected: 0 , ≤ 10.1.21 (semver)
Create a notification for this product.
Date Public
2026-10-23 12:44
Show details on NVD website

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CVE-2026-93582 (GCVE-0-2026-93582)

Vulnerability from cvelistv5 – Published: 2026-10-12 06:49 – Updated: 2026-10-15 19:14
VLAI
Title
Authentication Bypass via Spoofed Remote-User Header in HTTP Basic Authentication
Summary
The HTTP Basic Authentication modules in ((OTRS)) Community Edition 6 and prior accept the authenticated username from either the REMOTE_USER or HTTP_REMOTE_USER environment variable. In CGI and mod_perl based deployments, HTTP request headers may be mapped to corresponding HTTP_* environment variables. As a result, an unauthenticated remote attacker can supply a crafted Remote-User request header which is exposed to the application as HTTP_REMOTE_USER. When HTTP Basic Authentication is configured as the authentication backend, OTRS trusts this value as an already authenticated username and does not perform an additional password verification. An attacker may therefore authenticate through the Generic Interface as an existing agent or customer user without knowing the corresponding credentials. The resulting privileges depend on the account being impersonated. Successful exploitation may allow access to confidential information and modification of data or configuration with the permissions of the affected user. Exploitation requires HTTP Basic Authentication to be configured as an authentication backend and a web server environment in which attacker-controlled HTTP headers are exposed through the corresponding HTTP_* environment variables. OTRS 7 and later are not affected by this attack vector due to the use of Mojolicious/Hypnotoad and does not expose arbitrary request headers through %ENV in the manner required for exploitation. The supported REMOTE_USER mechanism additionally requires validation through the configured SSO shared secret. The unused HTTP_REMOTE_USER fallback has nevertheless been removed as a security-hardening measure. Please note that ((OTRS)) Community Edition 6.x and before are vulnerable. Products based on the ((OTRS)) Community Edition also very likely to be affected
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 16:41 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
OTRS CNA
Impacted products
Vendor Product Version
OTRS GmbH (former OTRS AG) OTRS Unaffected: 7.0.x
Unaffected: 8.0.x
Unaffected: 2023.x
Unaffected: 2024.x
Unaffected: 2025.x
Unaffected: 2026.x
Create a notification for this product.
OTRS GmbH (former OTRS AG) ((OTRS)) Community Edition Affected: 6.x
Create a notification for this product.
Date Public
2026-10-12 07:00
Show details on NVD website

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CVE-2026-93538 (GCVE-0-2026-93538)

Vulnerability from cvelistv5 – Published: 2026-09-28 14:10 – Updated: 2026-09-28 16:22
VLAI
Title
Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet
Summary
A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 15:46 UTC
CWE
  • CWE-290 - Authentication bypass by spoofing
  • CWE-639 - Authorization bypass through User-Controlled key
Assigner
suse CNA
References
Impacted products
Vendor Product Version
SUSE Rancher Affected: 0.16.0 , < 0.16.1 (semver)
Affected: 0.15.0 , < 0.15.6 (semver)
Affected: 0.14.0 , < 0.14.10 (semver)
Affected: 0.13.0 , < 0.13.15 (semver)
Affected: 0.12.0 , < 0.12.19 (semver)
    cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*
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    cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*
    cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-28 14:05
Show details on NVD website

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CVE-2026-92929 (GCVE-0-2026-92929)

Vulnerability from cvelistv5 – Published: 2026-09-22 23:10 – Updated: 2026-09-23 14:59
VLAI
Summary
OpenEye Apex Network Video Recorder (NVR) firmware 3.2.9.376 trusts an X-Forwarded-For header supplied by an arbitrary client when determining the request source address. An unauthenticated remote attacker can spoof a loopback address to bypass local-connection-only security controls exposed on the affected non-TLS web interfaces and disclose configuration information. The underlying design has been present since at least firmware 2.2.3.4. Upgrade to version 3.5.4.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 14:58 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
Impacted products
Show details on NVD website

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CVE-2026-92546 (GCVE-0-2026-92546)

Vulnerability from cvelistv5 – Published: 2026-10-27 12:58 – Updated: 2026-11-09 11:20 Exclusively Hosted Service
VLAI
Title
Authentication Bypass with X-Agentic-Ally-Token in Keepnet Labs Agentic AI / Agentic Ally
Summary
Authentication bypass by spoofing vulnerability in Keepnet Labs Ltd. Agentic AI / Agentic Ally allows Authentication Bypass. This issue affects Agentic AI / Agentic Ally: before 0ef61f2e.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-04 19:10 UTC
CWE
  • CWE-290 - Authentication bypass by spoofing
Assigner
TR-CERT CNA
References
Impacted products
Vendor Product Version
Keepnet Labs Ltd. Agentic AI / Agentic Ally Affected: 0 , < 0ef61f2e (custom)
Create a notification for this product.
Date Public
2026-10-27 12:50
Show details on NVD website

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CVE-2026-92395 (GCVE-0-2026-92395)

Vulnerability from cvelistv5 – Published: 2026-09-16 14:35 – Updated: 2026-09-17 18:39
VLAI
Title
@fastify/proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet
Summary
@fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as ::ffff:10.0.0.0/8 instead of the correct ::ffff:10.0.0.0/104, is accepted without error but trusts every IPv4 address on the internet rather than the block it names. Because the socket peer then becomes trusted at hop 0, any unauthenticated client can supply an arbitrary X-Forwarded-For header and control the address the application reads, which defeats IP-based access control, rate limiting, geolocation, and audit logging. The plugin inherited this defect from the upstream proxy-addr module (CVE-2026-90711). The issue is fixed in @fastify/proxy-addr 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, ensure any IPv4-mapped IPv6 trust subnet uses a prefix length of at least 97, or express the range in plain IPv4 notation.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 18:38 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
  • CWE-348 - Use of Less Trusted Source
  • CWE-697 - Incorrect Comparison
Assigner
openjs CNA
Impacted products
Vendor Product Version
@fastify/proxy-addr @fastify/proxy-addr Affected: 3.0.0 , < 5.1.1 (semver)
Unaffected: 5.1.1 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-91914 (GCVE-0-2026-91914)

Vulnerability from cvelistv5 – Published: 2026-10-30 13:37 – Updated: 2026-10-30 15:07
VLAI
Summary
Dell OpenManage Enterprise, versions prior to 4.8.0, contains an Authentication Bypass by Spoofing vulnerability. An unauthenticated attacker with adjacent network access could potentially exploit this vulnerability, leading to Session theft.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 14:22 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
dell CNA
References
Impacted products
Vendor Product Version
Dell OpenManage Enterprise Affected: 0 , < 4.8.0 or later (semver)
Create a notification for this product.
Date Public
2026-10-19 06:30
Show details on NVD website

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  "dataVersion": "5.2"
}

No mitigation information available for this CWE.

CAPEC-21: Exploitation of Trusted Identifiers

An adversary guesses, obtains, or "rides" a trusted identifier (e.g. session ID, resource ID, cookie, etc.) to perform authorized actions under the guise of an authenticated user or service.

CAPEC-22: Exploiting Trust in Client

An attack of this type exploits vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by communicating directly with the server where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.

CAPEC-459: Creating a Rogue Certification Authority Certificate

An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.

CAPEC-461: Web Services API Signature Forgery Leveraging Hash Function Extension Weakness

An adversary utilizes a hash function extension/padding weakness, to modify the parameters passed to the web service requesting authentication by generating their own call in order to generate a legitimate signature hash (as described in the notes), without knowledge of the secret token sometimes provided by the web service.

CAPEC-473: Signature Spoof

An attacker generates a message or datablock that causes the recipient to believe that the message or datablock was generated and cryptographically signed by an authoritative or reputable source, misleading a victim or victim operating system into performing malicious actions.

CAPEC-476: Signature Spoofing by Misrepresentation

An attacker exploits a weakness in the parsing or display code of the recipient software to generate a data blob containing a supposedly valid signature, but the signer's identity is falsely represented, which can lead to the attacker manipulating the recipient software or its victim user to perform compromising actions.

CAPEC-59: Session Credential Falsification through Prediction

This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

CAPEC-60: Reusing Session IDs (aka Session Replay)

This attack targets the reuse of valid session ID to spoof the target system in order to gain privileges. The attacker tries to reuse a stolen session ID used previously during a transaction to perform spoofing and session hijacking. Another name for this type of attack is Session Replay.

CAPEC-667: Bluetooth Impersonation AttackS (BIAS)

An adversary disguises the MAC address of their Bluetooth enabled device to one for which there exists an active and trusted connection and authenticates successfully. The adversary can then perform malicious actions on the target Bluetooth device depending on the target’s capabilities.

CAPEC-94: Adversary in the Middle (AiTM)

An adversary targets the communication between two components (typically client and server), in order to alter or obtain data from transactions. A general approach entails the adversary placing themself within the communication channel between the two components.