Rack Session
Monthly
Session authentication bypass in Rack::Session::Cookie 2.0.0 through 2.1.1 allows unauthenticated remote attackers to forge valid session cookies and gain unauthorized access. When configured with secrets, the implementation incorrectly falls back to a default decoder on decryption failures rather than rejecting malformed cookies, enabling attackers to manipulate session state without any secret knowledge. CVSS 9.3 (Critical) with network attack vector, low complexity, and no privileges required. No public exploit or active exploitation (CISA KEV) identified at time of analysis, though the simplicity of the attack vector (AC:L, PR:N) suggests exploitation is straightforward once the vulnerability is understood.
Session authentication bypass in Rack::Session::Cookie 2.0.0 through 2.1.1 allows unauthenticated remote attackers to forge valid session cookies and gain unauthorized access. When configured with secrets, the implementation incorrectly falls back to a default decoder on decryption failures rather than rejecting malformed cookies, enabling attackers to manipulate session state without any secret knowledge. CVSS 9.3 (Critical) with network attack vector, low complexity, and no privileges required. No public exploit or active exploitation (CISA KEV) identified at time of analysis, though the simplicity of the attack vector (AC:L, PR:N) suggests exploitation is straightforward once the vulnerability is understood.