{"id":"GHSA-ggw7-9675-6v4v","aliases":["CVE-2026-34579"],"title":"MantisBT has an authorization bypass in private issue monitoring","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"MODERATE","description":"Using a crafted POST request to bug_monitor_add.php, a user with project-level access can add themselves as a monitor for a private issue they do not have access to. Despite displaying an Access Denied error, the application accepts the request and creates a monitor relationship for the private issue.\n\n\n### Impact\nDirect access to the private issue remains blocked, but the user will receive email notifications for updates, leading to disclosure of the private issue's metadata and content.\n\n### Patches\n- 0a93267deba445fb9d15250c16e6fdb1246ffa65\n\n### Workarounds\nNone\n\n### Credits\nThanks to Vishal Shukla for discovering and responsibly reporting the issue.","severity":"medium","score":5.3,"published":"2026-05-11T19:32:22.000Z","modified":"2026-09-10T03:51:05.765Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","sources":[{"name":"OSV · GHSA-ggw7-9675-6v4v","url":"https://osv.dev/vulnerability/GHSA-ggw7-9675-6v4v"}],"ranges":[{"events":[{"introduced":"2.26.1"},{"fixed":"2.28.2"}],"type":"ECOSYSTEM"}],"versions":["2.26.1","2.26.2","2.26.3","2.26.4","2.27.0","2.27.1","2.27.2","2.27.3","2.28.0","2.28.1"],"fixed":["2.28.2"]}],"sourceAffected":[],"references":["https://github.com/mantisbt/mantisbt/security/advisories/GHSA-ggw7-9675-6v4v","https://nvd.nist.gov/vuln/detail/CVE-2026-34579","https://github.com/mantisbt/mantisbt/commit/0a93267deba445fb9d15250c16e6fdb1246ffa65","https://github.com/mantisbt/mantisbt","https://mantisbt.org/bugs/view.php?id=36975"],"sources":[{"name":"OSV","id":"GHSA-ggw7-9675-6v4v","modified":"2026-09-10T03:51:05.765789042Z","url":"https://osv.dev/vulnerability/GHSA-ggw7-9675-6v4v"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":5.3}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T01:35:32.302Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}