Keycloak has authentication bypass via jwt algorithm confusion

Description A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the...

GHSA-J97H-3F8R-MRJR Keycloak has authentication bypass via jwt algorithm confusion

Description A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the...

CVE-2026-0265-check

CVE-2026-0265 Vulnerability Assessment Tool Safely determine whether a Palo Alto Networks PAN-OS GlobalProtect portal is vulnerable to CVE-2026-0265 without authenticating any session or modifying any state. Description CVE-2026-0265 is a remote authentication bypass affecting PAN-OS and Panorama...

Exploit for Improper Verification of Cryptographic Signature in Wso2 Api_Control_Plane

CVE-2026-5430 — WSO2 API Manager JWT Algorithm Bypass Det...

CVE-2026-14916 Kong API Gateway Enterprise: JWT Algorithm-Confusion

A JWT signature verification vulnerability affects Kong components that perform JWT validation for MCP OAuth2 or DataKit integrations inside Kong API Gateway Enterprise. The affected code does not properly validate that the JWT signing algorithm is compatible with the type of key used for...

CVE-2026-82454 Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in

The Omnivore API packages/api before the fix in commit abf53d6 contains an authentication bypass in Apple sign-in token verification. The decodeAppleToken function extracted the 'alg' field from the attacker-supplied JWT header and passed it as the sole allowed algorithm to jwt.verify. Using...

PT-2026-83433

Name of the Vulnerable Software and Affected Versions Omnivore API packages/api versions prior to commit abf53d6 Description An authentication bypass exists in the Apple sign-in token verification process. The decodeAppleToken function extracts the alg field from the JWT header provided by the us...

BIT-KEYCLOAK-2026-11800 Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to...

CVE-2026-55165 Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure

Lemur manages TLS certificate creation. Prior to 1.9.2, the JWT verifier in lemur/auth/service.py:130-137 used fetchtokenheader to read headerdata"alg" from an unverified token and passed that attacker-controlled value to decodewithmultiplesecrets. PyJWT 2.x rejects alg=none with the configured...

CVE-2026-63761 SurrealDB before 3.1.0 Algorithm Downgrade via ES512

SurrealDB before 3.1.0 silently substitutes the ES384 algorithm when a JWT access method is configured with ALGORITHM ES512 DEFINE ACCESS ... TYPE JWT ALGORITHM ES512, because the underlying jsonwebtoken crate v10.x has no ES512 variant and the mapping defaults to ES384 without any error, warning...

PT-2026-61577

Name of the Vulnerable Software and Affected Versions SurrealDB versions prior to 3.1.0 Description When a JWT access method is configured using the ALGORITHM ES512 parameter within the DEFINE ACCESS statement, the system silently substitutes the ES384 algorithm. This occurs because the underlyin...

CVE-2026-57997

Strapi users-permissions plugin fails to restrict JWT algorithms when plugin::users-permissions.jwt.algorithm is not explicitly configured, allowing acceptance of HS384 and HS512 tokens alongside HS256. Attackers possessing the jwtSecret can mint tokens with non-standard HMAC variants to bypass...

Duplicate Advisory: Authentication bypass via jwt algorithm confusion

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-j97h-3f8r-mrjr. This link is maintained to preserve external references. Original Description A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows a...

CVE-2026-11800

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to...

org.keycloak:keycloak-services: Keycloak: Authentication bypass via JWT algorithm confusion

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to...

CVE-2026-11800: Improper Verification of Cryptographic Signature

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to...

CVE-2026-39999 Apache APISIX: JWT Algorithm Confusion allows authentication bypass

Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to upgrade to version v3.17.0, which...

CVE-2026-39413 LightRAG has a JWT Algorithm Confusion Vulnerability in LightRAG API

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode call does not explicitly deny the 'none'...

CVE-2026-39413 LightRAG has a JWT Algorithm Confusion Vulnerability in LightRAG API

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode call does not explicitly deny the 'none'...

CVE-2026-39413

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode call does not explicitly deny the 'none'...