PT-2026-104580

Name of the Vulnerable Software and Affected Versions OpenAM versions prior to 16.1.3 Description The OAuth2 Provider PKCE enforcement is only applied to authorization requests where the response type is exactly code. Consequently, codes issued via OpenID Connect hybrid flows such as code token,...

PT-2026-105863

Summary A timing side-channel vulnerability exists in the PKCE RFC 7636 implementation of the Authorization Code Grant flow. The code challenge method plain function uses Python's standard == operator for string comparison instead of a constant-time comparison function, potentially allowing...

CVE-2026-49265

A timing side-channel vulnerability exists in the PKCE RFC 7636 implementation of the Authorization Code Grant flow. The "codechallengemethodplain" function uses Python's standard "==" operator for string comparison instead of a constant-time comparison function, potentially allowing timing-based...

Official MCP Python SDK Flaw Can Let Malicious Servers Steal OAuth Credentials

A malicious MCP server could trick an application built on the official MCP Python SDK into handing over the OAuth credentials it uses to log in to a real service, the SDK's maintainers said in a security advisory. Affected versions sent the client secret, the authorization code, and the PKCE pro...

PT-2026-102981

Name of the Vulnerable Software and Affected Versions oauthlib affected versions not specified Description A timing side-channel exists in the PKCE implementation of the Authorization Code Grant flow. The functions code challenge method plain and code challenge method s256 in the file...

EUVD-2026-88033

Obot before v0.23.0 affected versions = v0.22.1 running with OBOTSERVERENABLEAUTHENTICATION=true exposes OAuth dynamic client registration without authentication and without any restriction on the redirect URIs a client may register. Because the authorization flow auto-completes for an already...

CVE-2026-92289

A flaw was found in lemonldap-ng. When configured to accept either client secrets or Proof Key for Code Exchange PKCE, a security mechanism designed to protect authorization codes, the portal fails to validate client credentials properly for public clients. A remote attacker who intercepts an...

CVE-2026-92289

Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint...

CVE-2026-92289

Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl are vulnerable to a PKCE bypass in "PKCE or secret" mode. The root cause is that the checkEndPointAuthenticationCredentials function fails to verify the client secret for public Relying Parties. When oidcRPMetaDataOptionsRequirePKC...

CVE-2026-92289 Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret

Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint...

PT-2026-98320

Name of the Vulnerable Software and Affected Versions Lemonldap::NG::Portal versions 2.23.0 through 2.23.3 Description An issue exists where public Relying Parties in PKCE or secret mode can bypass Proof Key for Code Exchange PKCE, a security extension for OAuth 2.0 that prevents authorization co...

CVE-2026-92289: Weak Authentication

Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint...

org.apache.cxf/cxf: Apache CXF: Authorization Code Replay via Race Condition

A flaw was found in Apache CXF. A race condition in the JCacheCodeDataProvider allows a remote attacker to redeem a single authorization code multiple times through concurrent requests. This can result in the issuance of multiple distinct, valid access tokens, potentially leading to unauthorized...

org.apache.cxf/cxf: Apache CXF: Authorization Code Substitution via missing c_hash validation

A flaw was found in Apache CXF. When operating in the OpenID Connect Hybrid Flow, Apache CXF does not enforce the validation of the chash parameter. This vulnerability allows a remote attacker, through a non-compliant or misconfigured Identity Provider IdP, to perform Authorization Code...

org.apache.cxf/cxf: Apache CXF: Authorization code replay due to flaw in DefaultEncryptingCodeDataProvider

A flaw was found in Apache CXF's DefaultEncryptingCodeDataProvider. This vulnerability allows a remote attacker to redeem a captured authorization code an unlimited number of times. The flaw exists due to an issue in the removeCodeGrant functionality, which fails to properly invalidate used...

Linux Distros Unpatched Vulnerability : CVE-2026-92289

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in PKCE or secret mode because...

CVE-2026-96446

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that...

CVE-2026-96446

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that...

EUVD-2026-85221

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that...

CVE-2026-96446 Keycloak-services: keycloak-services: par single-use bypass via prompt=none silent authentication path

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that...