Common Weakness Enumeration

CWE-757

Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

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.

CVE-2026-32650 (GCVE-0-2026-32650)

Vulnerability from cvelistv5 – Published: 2026-04-17 19:52 – Updated: 2026-04-17 20:26
VLAI
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Anviz Anviz CrossChex Standard Affected: All versions
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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
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
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
  • CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
Impacted products
Vendor Product Version
pgjdbc pgjdbc Affected: >= 42.7.4, < 42.7.12
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-54780 (GCVE-0-2026-54780)

Vulnerability from cvelistv5 – Published: 2026-07-08 22:15 – Updated: 2026-07-09 19:21
VLAI
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
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
  • CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
Impacted products
Vendor Product Version
CoreWCF CoreWCF Affected: >= 1.9.0, < 1.9.1
Affected: < 1.8.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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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
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
2.1 (Low)
CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Clear
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
Impacted products
Vendor Product Version
wolfSSL wolfSSL Affected: 5.2.0 , ≤ 5.9.1 (semver)
Create a notification for this product.
Credits
Marcin Olejnik (Rockwell Automation)
Show details on NVD website
To clipboard 

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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
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)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
5.7 (Medium)
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-757 - Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
Assigner
References
Impacted products
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)
Create a notification for this product.
Credits
1seal.org
Show details on NVD website
To clipboard 

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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.

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