Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has an open redirect via the redirect_uri field in an OAuth authorization request (that results in an error response) with the 'openid' scope and a prompt=none value. This allows phishing attacks against the authorization flow.

Mod_auth_openidc.c in the Ping Identity OpenID Connect authentication module for Apache (aka mod_auth_openidc) before 2.14 allows remote attackers to spoof page content via a malicious URL provided to the user, which triggers an invalid request.

OpenIDM through 4.0.0 and 4.5.0 is vulnerable to reflected cross-site scripting (XSS) attacks within the Admin UI, as demonstrated by the _sortKeys parameter to the authzRoles script under managed/user/.

OpenIDM through 4.0.0 and 4.5.0 is vulnerable to persistent cross-site scripting (XSS) attacks within the Admin UI, as demonstrated by a crafted Managed Object Name.

In OpenIDM through 4.0.0 before 4.5.0, the info endpoint may leak sensitive information upon a request by the "anonymous" user, as demonstrated by responses with a 200 HTTP status code and a JSON object containing IP address strings. This is related to a missing access-control check in bin/defaults/script/info/login.js.

The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.5 for the Apache HTTP Server does not skip OIDC_CLAIM_ and OIDCAuthNHeader headers in an "OIDCUnAuthAction pass" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.

The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.6 for the Apache HTTP Server does not skip OIDC_CLAIM_ and OIDCAuthNHeader headers in an "AuthType oauth20" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.

message/ax/AxMessage.java in OpenID4Java before 0.9.6 final, as used in JBoss Enterprise Application Platform 5.1 before 5.1.2, Step2, Kay Framework before 1.0.2, and possibly other products does not verify that Attribute Exchange (AX) information is signed, which allows remote attackers to modify potentially sensitive AX information without detection via a man-in-the-middle (MITM) attack.

PHP remote file inclusion vulnerability in includes/openid/Auth/OpenID/BBStore.php in phpBB Openid 0.2.0 allows remote attackers to execute arbitrary PHP code via a URL in the openid_root_path parameter.

Cross-site request forgery (CSRF) vulnerability in OpenID allows remote attackers to restore the login session of a user on an OpenID enabled site via unspecified vectors related to an arbitrary remote web site and cached tokens, after the user has signed into an OpenID server, logged into the OpenID enabled site, and then logged out of the OpenID enabled site.