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.
57 vulnerabilities reference this CWE, most recent first.
CVE-2026-72889 (GCVE-0-2026-72889)
Vulnerability from cvelistv5 – Published: 2026-08-19 07:20 – Updated: 2026-08-19 21:07
VLAI
EPSS
VEX
Title
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify
Summary
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.
verify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed.
A provider deployed on RSA-SHA1 holds only the consumer public key, and RFC 5849 does not use consumer_secret for that method, so the required parameter is filled with a placeholder. A client that names HMAC-SHA1 instead has its signature checked against that placeholder, so a guessable one is enough to forge requests for any consumer key and token.
Severity
No CVSS data available.
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/vurtdev/Net-OAuth/security/adv… | vendor-advisory |
| https://github.com/vurtdev/Net-OAuth/commit/c467a… | patch |
| https://metacpan.org/release/RRWO/Net-OAuth-0.33/… | release-notes |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| http://www.openwall.com/lists/oss-security/2026/08/19/2 |
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CVE-2026-72887 (GCVE-0-2026-72887)
Vulnerability from cvelistv5 – Published: 2026-08-16 13:50 – Updated: 2026-08-17 16:29
VLAI
EPSS
VEX
Title
Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token
Summary
Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token.
Passing a callback to the constructor selects OAuth 1.0a. get_request_token then revokes that choice when the request token response omits oauth_callback_confirmed, with no exception, no warning and no option to require 1.0a. The access token request is built from the OAuth 1.0 message class, which has no verifier parameter, so oauth_verifier is dropped from the request even when get_access_token was passed one.
oauth_verifier is the binding that OAuth 1.0a added between the authorization step and the token exchange. An application that asked for 1.0a and gets 1.0 is open to OAuth 1.0 session fixation, where an attacker obtains a request token, has the victim authorize it, and then completes the exchange themselves, linking the victim's provider account to a session the attacker controls. No attacker action sets up the downgrade: a provider that does not confirm the callback is enough.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 16:29 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/vurtdev/Net-OAuth/security/adv… | vendor-advisory |
| https://metacpan.org/release/RRWO/Net-OAuth-0.32/… | release-notes |
| https://github.com/vurtdev/Net-OAuth/commit/fd505… | patch |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| http://www.openwall.com/lists/oss-security/2026/08/16/3 |
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CVE-2026-55953 (GCVE-0-2026-55953)
Vulnerability from cvelistv5 – Published: 2026-07-27 15:21 – Updated: 2026-08-03 21:44
VLAI
EPSS
VEX
Title
TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication
Summary
The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected.
An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All subsequent application traffic is readable and modifiable by the attacker.
This issue affects OTP from OTP R13B03 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to ssl from 3.10.7 before 11.2.12.11, from 11.3 before 11.6.0.4, and from 11.7 before 11.7.4. Whether OTP before OTP R13B03, corresponding to ssl before 3.10.7, is affected is unknown.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 18:33 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-55953.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-55953 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/064e23641461… | patch |
| https://github.com/erlang/otp/commit/0a82596d425a… | patch |
| https://github.com/erlang/otp/commit/e6ff938116b2… | patch |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Erlang | OTP |
Unknown:
0 , < R13B03
(otp)
Affected: R13B03 , < 27.3.4.15 (otp) Affected: 28.0 , < 28.5.0.4 (otp) Affected: 29.0 , < 29.0.4 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
|
| Erlang | OTP |
Unknown:
0 , < 3.10.7
(otp)
Affected: 3.10.7 , < 11.2.12.11 (otp) Affected: 11.3 , < 11.6.0.4 (otp) Affected: 11.7 , < 11.7.4 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
|
| Erlang | OTP |
Affected:
84adefa331c4159d432d22840663c38f155cd4c1 , < *
(git)
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
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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
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
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
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
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
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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
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
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Anviz | Anviz CrossChex Standard |
Affected:
All versions
|
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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
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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
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
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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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.