Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
851 vulnerabilities reference this CWE, most recent first.
CVE-2026-89134 (GCVE-0-2026-89134)
Vulnerability from cvelistv5 – Published: 2026-09-27 09:16 – Updated: 2026-09-29 16:37
VLAI
EPSS
VEX
Title
Subject CN name-constraint check bypassed when non-DNS SAN present
Summary
A certificate with no dNSName SAN but another SAN type present (e.g. registeredID or iPAddress) bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert->subjectCN != NULL && cert->altNames == NULL && !cert->isCA instead of "no dNSName SAN", so an out-of-scope CN was accepted. This incomplete fix from CVE-2026-6731, leading to the name-constraint check issue, was introduced in wolfSSL version 5.9.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:35 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
wolfSSL
CNA
References
1 reference
Date Public
2026-09-26 12:00
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CVE-2026-89133 (GCVE-0-2026-89133)
Vulnerability from cvelistv5 – Published: 2026-09-27 09:18 – Updated: 2026-09-29 16:16
VLAI
EPSS
VEX
Title
NameConstraints not enforced across unconstrained intermediate CA
Summary
wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted certificates for hostnames they shouldn't be allowed to cover, due to a chain-walking state-machine bug that resets the validation state when encountering an intermediate without NameConstraints, thereby bypassing cryptographic delegation controls. This defect exists in the default build configuration that makes use of certificates where name constraint extensions are used. Thanks to Jack Lloyd, PathDiff, and Ben Smyth for reporting the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:11 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
wolfSSL
CNA
References
1 reference
Date Public
2026-09-26 12:00
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CVE-2026-89102 (GCVE-0-2026-89102)
Vulnerability from cvelistv5 – Published: 2026-09-27 09:22 – Updated: 2026-09-29 16:04
VLAI
EPSS
VEX
Title
OCSP stapling v2 multi accepts non-CA chain certificates as issuers
Summary
In wolfSSL versions 5.7.2 through 5.9.2 there is a client-side implementation flaw in RFC 6961, multiple OCSP response stapling, which can lead to certificate forgery. When a wolfSSL client enables OCSP stapling with the HAVE_CERTIFICATE_STATUS_REQUEST_V2 feature and calls wolfSSL_UseOCSPStaplingV2(ssl, WOLFSSL_CSR2_OCSP_MULTI, options), the client accepts any certificate in the peer's chain as a certificate authority without verifying that the certificate is actually authorized to act as one. This means that an attacker who possesses any certificate that chains to a CA trusted by the client (along with its private key) can forge certificates for arbitrary identities that will be accepted as valid by the client. The end entity certificate of the server is stored in the persistent trust store, affecting subsequent connections that reuse the context even when OCSP multi usage is not employed. Found by internal wolfSSL testing.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:03 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
wolfSSL
CNA
References
1 reference
Impacted products
Date Public
2026-09-26 12:00
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CVE-2026-87944 (GCVE-0-2026-87944)
Vulnerability from cvelistv5 – Published: 2026-10-22 01:21 – Updated: 2026-10-22 16:51
VLAI
EPSS
VEX
Title
SAML SSO - Service Provider - Critical - Improper certificate validation - SA-CONTRIB-2026-142
Summary
Improper Certificate Validation vulnerability in Drupal SAML SSO - Service Provider allows Adversary in the Middle (AiTM). This issue affects SAML SSO - Service Provider versions: from 0.0.0 to 3.2.0.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 16:51 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
drupal
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Drupal | SAML SSO - Service Provider |
Affected:
0.0.0 , < 3.2.0
(semver)
|
Date Public
2026-09-09 17:20
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CVE-2026-87880 (GCVE-0-2026-87880)
Vulnerability from cvelistv5 – Published: 2026-10-28 10:09 – Updated: 2026-10-29 10:45
VLAI
EPSS
VEX
Summary
Sensitive information disclosure due to missing SSL certificate verification affecting one component. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 03:57 UTC
CWE
Assigner
Acronis
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://security-advisory.acronis.com/advisories/… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Acronis | Acronis Cyber Protect 17 |
Affected:
unspecified , < 42587
(semver)
|
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CVE-2026-87872 (GCVE-0-2026-87872)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:06 – Updated: 2026-09-14 13:39
VLAI
EPSS
VEX
Title
Community.general: community.general: ocapi module_utils (ocapi_command, ocapi_info) hardcode validate_certs=false with no override, enabling tls man-in-the-middle and credential disclosure
Summary
A flaw was found in the OCAPI modules (ocapi_command, ocapi_info) of the
community.general Ansible collection. The shared OCAPI request helper disables
TLS certificate validation on every request and the modules expose no parameter
to re-enable it, while sending HTTP Basic-Auth credentials to an https endpoint.
An attacker positioned on the network path between the Ansible controller and the
OCAPI-managed storage/enclosure device can present any certificate, intercept the
session, capture the credentials, and tamper with responses.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:39 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
redhat
CNA
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-87872 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2530988 | issue-trackingx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Ceph Storage 5 |
cpe:/a:redhat:ceph_storage:5
|
|
| Red Hat | Red Hat Ceph Storage 9 |
cpe:/a:redhat:ceph_storage:9
|
|
| Red Hat | Red Hat OpenStack Platform 17.1 |
cpe:/a:redhat:openstack:17.1
|
|
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0
|
Date Public
2026-09-09 14:25
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CVE-2026-87733 (GCVE-0-2026-87733)
Vulnerability from cvelistv5 – Published: 2026-09-09 04:08 – Updated: 2026-09-09 13:02
VLAI
EPSS
VEX
Summary
An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml. The ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets accept 0x00, the encoding of the point at infinity, as a public key. With that public key, signatures can be forged without a private key.
Severity
6.2 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 13:02 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
mitre
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OCaml | mirage-crypto-ec |
Affected:
0 , < 2.2.0
(semver)
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CVE-2026-87425 (GCVE-0-2026-87425)
Vulnerability from cvelistv5 – Published: 2026-10-08 06:51 – Updated: 2026-10-08 17:54
VLAI
EPSS
VEX
Summary
An unauthenticated remote attacker can modify the TLS client trust store in Brocade ASCG versions before 3.5.0. By supplying an unauthorized Certificate Authority (CA) certificate to an unauthenticated management interface, the attacker can cause the system to trust unauthorized certificates, potentially enabling Man-in-the-Middle (MITM) attacks against outbound communications with managed switches and peer nodes.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 15:14 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
brocade
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Brocade | Brocade Active Support Connectivity Gateway |
Affected:
0 , < 3.5.0
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CVE-2026-86474 (GCVE-0-2026-86474)
Vulnerability from cvelistv5 – Published: 2026-09-16 10:02 – Updated: 2026-09-16 13:25
VLAI
EPSS
VEX
Title
Improper Certificate Validation in the Firmware Download vulnerability
Summary
The lack of TLS certificate validation when downloading firmware updates in VEO and VEO-XS Wi-Fi monitors, in versions prior to 01.48.001, allows an attacker to perform man-in-the-middle attacks on the update channel.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 13:25 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
FERMAX
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://fermax.com/security-advisories | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Fermax Electronica S.A.U. | DUOX PLUS monitor firmware (VEO Wi-Fi range) |
Affected:
0 , < 01.48.001
(custom)
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CVE-2026-86185 (GCVE-0-2026-86185)
Vulnerability from cvelistv5 – Published: 2026-09-05 11:38 – Updated: 2026-09-08 18:15
VLAI
EPSS
VEX
Title
Bilibili Desktop through 1.18.0 Remote Code Execution via TLS Verification Bypass
Summary
Bilibili Desktop through 1.18.0 disables TLS certificate verification process-wide and executes unsigned remote JavaScript configuration without integrity checks. An attacker in an on-path network position can intercept configuration fetches, inject arbitrary JavaScript executed in the renderer with access to the privileged IPC bridge, and execute system commands or steal login credentials.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 18:15 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
VulnCheck
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/LeoWSY-hashblue/bilibili-deskt… | third-party-advisory |
| https://github.com/LeoWSY-hashblue/bilibili-deskt… | technical-description |
| https://app.bilibili.com/ | product |
| https://www.vulncheck.com/advisories/bilibili-des… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Bilibili | Bilibili Desktop |
Affected:
0 , ≤ 1.18.0
(custom)
|
Date Public
2026-09-04 00:00
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Mitigation
Architecture and Design
Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation
Implementation
If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
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-475: Signature Spoofing by Improper Validation
An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.