GHSA-VXV2-8J6R-PCPG Gitea: OAuth token introspection returns metadata of tokens issued to other clients (RFC 7662 section 4 violation)

Live reproduction against Gitea 1.26.1 Setup: Gitea 1.26.1 docker stack with two users admin and victim and two OAuth applications owned by different users: Client A: id=5dda747d-7fdd-4694-85ff-ce4f893ce51e owner=admin Client B: id=588f778f-4a41-4914-ae01-85d776c369db owner=victim admin runs an...

PT-2026-63294

Name of the Vulnerable Software and Affected Versions Gitea versions prior to 1.26.2 Description An issue exists where the OAuth token introspection endpoint allows any authenticated OAuth client to retrieve metadata for tokens issued to other clients, violating RFC 7662 section 4. The server fai...

GO-2026-5291 nuts-node has JWT type confusion in v1 access token introspection that allows VP replay as access token in github.com/nuts-foundation/nuts-node

nuts-node has JWT type confusion in v1 access token introspection that allows VP replay as access token in github.com/nuts-foundation/nuts-node...

Authentication Bypass

github.com/googleapis/mcp-toolbox is vulnerable to Authentication Bypass. The vulnerability is due to improper validation of the optional issuer iss claim during OAuth 2.0 opaque token introspection. If the introspection response omits the iss field, the issuer validation is silently skipped, whi...

Authentication Bypass

github.com/googleapis/mcp-toolbox is vulnerable to Authentication Bypass. The vulnerability is due to improper validation of OAuth 2.0 token introspection responses, where the mandatory active field is not verified if omitted, which allows an attacker to bypass authentication by supplying an opaq...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication through the validateOpaqueToken process. An attacker can gain unauthorized access to protected tools and underlying data sources by submitting an OAuth 2.0 introspection response that omits the mandatory active...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication through the validateOpaqueToken process. An attacker can gain unauthorized access to protected tools and underlying data sources by submitting an OAuth 2.0 introspection response that omits the mandatory active...

googleapis/mcp-toolbox: authentication bypass vulnerability in the generic opaque token validation path (validateOpaqueToken)

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

CVE-2026-11717

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

EUVD-2026-37880

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When the toolbox validates an opaque token via an OAuth 2.0 introspection endpoint RFC 7662, it decodes the response into an introspectResp struct. However, the...

CVE-2026-11717

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

EUVD-2026-37879

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

CVE-2026-11717

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

CVE-2026-11717

CVE-2026-11717 details an authentication bypass in googleapis/mcp-toolbox, specifically in the validateOpaqueToken path. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp with Active as a *bool. The ...

Improper Access Control

Keycloak is vulnerable to Improper Access Control. The vulnerability is due to insufficient audience restriction enforcement in the OpenID Connect token introspection endpoint, which allows an authenticated confidential client to access sensitive token claims intended for other resource servers...

CVE-2026-50623

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint /services/oauth2/introspect can be accessed by any unauthenticated network attacker. However note that th...

CVE-2026-50623 Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint /services/oauth2/introspect can be accessed by any unauthenticated network attacker. However note that th...

EUVD-2026-36393

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint /services/oauth2/introspect can be accessed by any unauthenticated network attacker. However note that th...

CVE-2026-50623 Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint /services/oauth2/introspect can be accessed by any unauthenticated network attacker. However note that th...

CVE-2026-50623

CVE-2026-50623 affects Apache CXF’s OAuth2 TokenIntrospectionService. A missing 'throw' in the security context check permits access to the introspection endpoint (/services/oauth2/introspect) by any unauthenticated network attacker. This bypass is tied to a safeguard condition when authenticatio...