GitBucket 4.23.1 Unauthenticated Remote Code Execution

GitBucket 4.23.1 contains an unauthenticated remote code execution vulnerability that allows attackers to execute arbitrary commands by exploiting weak secret token generation and insecure file upload functionality. Attackers can brute-force the Blowfish encryption key, upload a malicious JAR plugin via the git-lfs endpoint, and execute system commands through an exposed exploit endpoint.

Jenkins GitBucket Plugin 0.8 and earlier does not sanitize Gitbucket URLs on build views, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to configure jobs.