CVE-2026-73309

CVE-2026-73309: Empty OAuth2 credentials bypass XenForo before 2.3.13 can skip OAuth2 client-secret and PKCE verification when an empty string reaches the token endpoint. What happens The endpoint checks whether clientsecret and codeverifier keys exist, then performs the comparisons only when the...

CVE-2026-73310

CVE-2026-73310: OAuth2 redirect URI not bound to authorization code XenForo before 2.3.13 does not bind an OAuth2 authorization code to the redirect URI used when that code was issued. What happens At the token endpoint, XenForo checks that the submitted redirecturi is somewhere in the client's...

OAuthLib: Bearer token can be retrieved as long as client knows a valid client ID for device workflow

Summary A call to the token endpoint with a grant type of "urn:ietf:params:oauth:grant-type:devicecode" and a bogus devicecode is able to get a bearer token as long as they know a valid client ID enabled for the device workflow. Details Section 3.4 of the RFC 8628 spec says that the token endpoin...

GHSA-3JP2-3MRG-2VXC OAuthLib: Bearer token can be retrieved as long as client knows a valid client ID for device workflow

Summary A call to the token endpoint with a grant type of "urn:ietf:params:oauth:grant-type:devicecode" and a bogus devicecode is able to get a bearer token as long as they know a valid client ID enabled for the device workflow. Details Section 3.4 of the RFC 8628 spec says that the token endpoin...

PT-2026-127191

Summary A call to the token endpoint with a grant type of "urn:ietf:params:oauth:grant-type:device code" and a bogus device code is able to get a bearer token as long as they know a valid client ID enabled for the device workflow. Details Section 3.4 of the RFC 8628 spec says that the token...

Apache Kafka Client - Arbitrary File Read

Apache Kafka Client contains arbitrary file read and server-side request forgery caused by untrusted configuration of sasl.oauthbearer.token.endpoint.url and sasl.oauthbearer.jwks.endpoint.url, letting attackers read files or send requests to unintended locations, exploit requires untrusted party...

CVE-2026-101023

A flaw was found in Gitea. The OAuth2 Open Authorization token endpoint validates the signature and grant of a token during a refresh request, but fails to confirm that the submitted token is specifically a refresh token. An attacker or user possessing a valid, unexpired access token can exchange...

CVE-2026-101023

Gitea's OAuth2 token endpoint verified the signature and grant of a token submitted with the refreshtoken grant type, but not that the token was a refresh token. An unexpired access token for the same OAuth2 application and grant could be exchanged for a new access token and refresh token. Whoeve...

CVE-2026-101023

Gitea's OAuth2 token endpoint verified the signature and grant of a token submitted with the "refreshtoken" grant type, but not that the token was a refresh token. An unexpired access token for the same OAuth2 application and grant could be exchanged for a new access token and refresh token...

EUVD-2026-94061

Gitea's OAuth2 token endpoint verified the signature and grant of a token submitted with the refreshtoken grant type, but not that the token was a refresh token. An unexpired access token for the same OAuth2 application and grant could be exchanged for a new access token and refresh token. Whoeve...

keycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters

A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect OIDC token endpoint. This leads to high resource consumption and prolonged processing times, ultimate...

keycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters

A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect OIDC token endpoint. This leads to high resource consumption and prolonged processing times, ultimate...

keycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters

A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect OIDC token endpoint. This leads to high resource consumption and prolonged processing times, ultimate...

CVE-2026-59358

Improper authentication CWE-287 in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged clientcredentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer...

CVE-2026-59358 UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type

Improper authentication CWE-287 in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged clientcredentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer...

CVE-2026-59358 UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type

Improper authentication CWE-287 in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged clientcredentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer...

CVE-2026-59358 UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type

Improper authentication CWE-287 in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged clientcredentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer...

CVE-2026-59358

Cloud Foundry UAA (v3.7.0 to v79.6.0) and CF Deployment (up to v60.4.0) are vulnerable to an Improper Authentication (CWE-287) flaw in the OAuth token endpoint. The system fails to verify if a Bearer credential is a legitimate client secret, instead accepting any valid access token where the clie...

EUVD-2026-92988

Improper authentication CWE-287 in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged clientcredentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer...

PT-2026-106360

Name of the Vulnerable Software and Affected Versions Cloud Foundry UAA affected versions not specified Description Improper authentication in the OAuth token endpoint allows a remote, authenticated attacker with a valid user access token to obtain a fully-privileged client credentials token for...