Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-ggw7-9675-6v4v
Advisory ID github_osv/GHSA-ggw7-9675-6v4v
Aliases CVE-2026-34579
Summary MantisBT has an authorization bypass in private issue monitoring 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. ### Impact Direct 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. ### Patches - 0a93267deba445fb9d15250c16e6fdb1246ffa65 ### Workarounds None ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (2)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-201 Insertion of Sensitive Information Into Sent Data
System Score Found at
cvssv4 5.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ggw7-9675-6v4v/GHSA-ggw7-9675-6v4v.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/mantisbt/mantisbt
https://github.com/mantisbt/mantisbt/commit/0a93267deba445fb9d15250c16e6fdb1246ffa65
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-ggw7-9675-6v4v
https://mantisbt.org/bugs/view.php?id=36975
CVE-2026-34579 https://nvd.nist.gov/vuln/detail/CVE-2026-34579
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ggw7-9675-6v4v/GHSA-ggw7-9675-6v4v.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.