Common Weakness Enumeration
CWE-757
AllowedSelection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Abstraction: Base · Status: Incomplete
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
40 vulnerabilities reference this CWE, most recent first.
CVE-2026-54780 (GCVE-0-2026-54780)
Vulnerability from cvelistv5 – Published: 2026-07-08 22:15 – Updated: 2026-07-09 19:21
VLAI
EPSS
VEX
Title
CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass
Summary
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted. This issue is fixed in versions 1.8.1 and 1.9.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 19:21 UTC
CWE
Assigner
GitHub_M
CNA
References
6 references
| URL | Tags |
|---|---|
| https://github.com/CoreWCF/CoreWCF/security/advis… | x_refsource_CONFIRM |
| https://github.com/CoreWCF/CoreWCF/commit/5874231… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/commit/9104e58… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/commit/fea67b2… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 | x_refsource_MISC |
Impacted products
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CVE-2026-54291 (GCVE-0-2026-54291)
Vulnerability from cvelistv5 – Published: 2026-07-06 18:55 – Updated: 2026-07-06 19:47
VLAI
EPSS
VEX
Title
Silent channel-binding authentication downgrade via unsupported certificate algorithms
Summary
pgjdbc is an open source postgresql JDBC Driver. In releases 42.7.4 through 42.7.11, channelBinding=require connections can be silently downgraded from SCRAM-SHA-256-PLUS with channel binding to plain SCRAM-SHA-256 without it, losing the man-in-the-middle protection the setting is meant to guarantee. An attacker who can intercept the TLS connection can trigger the downgrade with a certificate whose signature algorithm has no tls-server-end-point channel-binding hash, because the bundled com.ongres.scram:scram-client returns an empty byte array instead of failing and pgJDBC ScramAuthenticator checks only that the server advertised a PLUS mechanism, without rejecting the empty binding or checking that the negotiated mechanism uses channel binding. This issue is fixed in version 42.7.12.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 19:47 UTC
CWE
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pgjdbc/pgjdbc/security/advisor… | x_refsource_CONFIRM |
| https://github.com/pgjdbc/pgjdbc/commit/77df98e4e… | x_refsource_MISC |
| https://github.com/ongres/scram/releases/tag/3.3 | x_refsource_MISC |
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CVE-2026-53712 (GCVE-0-2026-53712)
Vulnerability from cvelistv5 – Published: 2026-07-17 18:19 – Updated: 2026-07-17 19:09
VLAI
EPSS
VEX
Title
SCRAM: Silent channel-binding authentication downgrade via unsupported certificate algorithms
Summary
SCRAM (Salted Challenge Response Authentication Mechanism) is part of the family of Simple Authentication and Security Layer (SASL, RFC 4422) authentication mechanisms. Prior to 3.3, a flaw in com.ongres.scram:scram-client and com.ongres.scram:scram-common allows an attacker capable of a TLS man-in-the-middle attack to silently downgrade a connection from SCRAM-SHA-256-PLUS with channel binding to standard SCRAM-SHA-256 without channel binding when TlsServerEndpoint processes an X.509 certificate using a modern signature algorithm such as Ed25519; getChannelBindingData() can return an empty byte array after NoSuchAlgorithmException, and the ScramClient builder treats that as absent channel-binding data. This issue is fixed in version 3.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:08 UTC
CWE
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ongres/scram/security/advisori… | x_refsource_CONFIRM |
| https://github.com/ongres/scram/releases/tag/3.3 | x_refsource_MISC |
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CVE-2026-48747 (GCVE-0-2026-48747)
Vulnerability from cvelistv5 – Published: 2026-07-14 19:16 – Updated: 2026-07-15 14:22
VLAI
EPSS
VEX
Title
Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:22 UTC
CWE
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | x_refsource_CONFIRM |
| https://github.com/symfony/symfony/commit/bdfe9fe… | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v7.4.13 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v8.0.13 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| symfony | symfony |
Affected:
>= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.13 |
|
| symfony | mailomat-mailer |
Affected:
>= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.13 |
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CVE-2026-32650 (GCVE-0-2026-32650)
Vulnerability from cvelistv5 – Published: 2026-04-17 19:52 – Updated: 2026-04-17 20:26
VLAI
EPSS
VEX
Title
Anviz CrossChex Standard Algorithm Downgrade
Summary
Anviz CrossChex Standard is vulnerable when an attacker manipulates the TDS7 PreLogin to disable
encryption, causing database credentials to be sent in plaintext and
enabling unauthorized database access.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-17 20:26 UTC
CWE
Assigner
icscert
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Anviz | Anviz CrossChex Standard |
Affected:
All versions
|
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CVE-2026-20578 (GCVE-0-2026-20578)
Vulnerability from cvelistv5 – Published: 2026-11-02 02:33 – Updated: 2026-11-02 15:00
VLAI
EPSS
VEX
Summary
In Modem, there is a possible information disclosure due to side channel information disclosure. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01879164; Issue ID: MSV-9846.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 15:00 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
MediaTek
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MediaTek, Inc. | MediaTek chipset |
Affected:
MT2716
Affected: MT6835 Affected: MT6858 Affected: MT6878 Affected: MT6881 Affected: MT6897 Affected: MT6899 Affected: MT6982 Affected: MT6986 Affected: MT6988 Affected: MT6991 Affected: MT6993 Affected: MT8668 Affected: MT8676 Affected: MT8678 Affected: MT8755 Affected: MT8775 Affected: MT8792 Affected: MT8793 Affected: MT8863 Affected: MT8873 Affected: MT8875 Affected: MT8883 |
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CVE-2026-18691 (GCVE-0-2026-18691)
Vulnerability from cvelistv5 – Published: 2026-08-11 18:46 – Updated: 2026-08-11 20:22
VLAI
EPSS
VEX
Title
Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
Summary
An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 20:21 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
mongodb
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MongoDB | MongoDB Server |
Affected:
8.3.0 , < 8.3.8
(semver)
Affected: 8.0 , < 8.0.29 (semver) Affected: 7.0 , < 7.0.40 (semver) |
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CVE-2026-6550 (GCVE-0-2026-6550)
Vulnerability from cvelistv5 – Published: 2026-04-20 19:20 – Updated: 2026-04-20 19:44
VLAI
EPSS
VEX
Title
Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Summary
Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts.
To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-20 19:44 UTC
CWE
- CWE-757 - Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
Assigner
AMZN
CNA
References
4 references
| URL | Tags |
|---|---|
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | AWS Encryption SDK for Python |
Affected:
2 , ≤ 2.5.1
(custom)
Affected: 3 , ≤ 3.3.0 (custom) Affected: 4 , ≤ 4.0.4 (custom) |
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CVE-2026-6092 (GCVE-0-2026-6092)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:06 – Updated: 2026-06-26 10:25
VLAI
EPSS
VEX
Title
Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured
Summary
When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encrypt rather than enforcing Encrypt-then-MAC.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 10:24 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
wolfSSL
CNA
References
2 references
Impacted products
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CVE-2026-4942 (GCVE-0-2026-4942)
Vulnerability from cvelistv5 – Published: 2026-07-17 19:32 – Updated: 2026-07-20 13:52
VLAI
EPSS
VEX
Title
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
Summary
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:52 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7278992 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | i |
Affected:
7.6
Affected: 7.5 Affected: 7.4 Affected: 7.3 cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:* |
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No mitigation information available for this CWE.
CAPEC-220: Client-Server Protocol Manipulation
An adversary takes advantage of weaknesses in the protocol by which a client and server are communicating to perform unexpected actions. Communication protocols are necessary to transfer messages between client and server applications. Moreover, different protocols may be used for different types of interactions.
CAPEC-606: Weakening of Cellular Encryption
An attacker, with control of a Cellular Rogue Base Station or through cooperation with a Malicious Mobile Network Operator can force the mobile device (e.g., the retransmission device) to use no encryption (A5/0 mode) or to use easily breakable encryption (A5/1 or A5/2 mode).
CAPEC-620: Drop Encryption Level
An attacker forces the encryption level to be lowered, thus enabling a successful attack against the encrypted data.