Threats tagged 'ghsa-4vx7-c7qw-2vx4'

CVE-2026-19349 is a critical authentication bypass vulnerability in Lemonldap::NG::Portal affecting certain versions that use the GitHub and LinkedIn OAuth2 backends. The flaw allows an unauthenticated visitor to replay a session identifier used as an OAuth2 state parameter to gain a valid SSO session without proper authentication. This occurs because the state parameter is stored as a regular SSO session lacking user and authentication level attributes, which some default configurations accept. Only deployments with the GitHub or LinkedIn authentication modules enabled are affected.