CVE-2026-40596 Details
Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.
A cross-site scripting (XSS) vulnerability has been identified in Mantis Bug Tracker (MantisBT) versions 2.11.0 through 2.28.1. This vulnerability allows any authenticated user to inject arbitrary HTML by updating their account's font family preference. The injected HTML is executed as a script, reflecting the XSS payload on every MantisBT page. Additionally, this vulnerability can be leveraged to take over the user's account by exploiting a Content Security Policy (CSP) bypass vulnerability, also present in MantisBT.
Users can update to MantisBT version 2.28.2, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 22, 2026CISA-ADP
Assessed May 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d | [email protected] | Source CodeVendor |
| https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3 | [email protected] | AdvisoryVendor |
| https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j | [email protected] | AdvisoryVendor |
| https://mantisbt.org/bugs/view.php?id=37011 | [email protected] | ExploitIssue TrackingRemedyVendor |
| https://mantisbt.org/bugs/view.php?id=37016 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Mantis Bug Tracker | >= 2.11.0, <= 2.28.1 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | New CVE Received | [email protected] |