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CVE-2026-40596
MantisBT is vulnerable to XSS and potential account takeover via user font family preference update
Overview
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.

Details
INFO

Published Date :

May 22, 2026, 7:25 p.m.

Last Modified :

May 22, 2026, 7:25 p.m.

Remotely Exploit :

No

Source :

GitHub_M
Impact
Affected Products

The following products are affected by CVE-2026-40596 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mantisbt mantisbt
: Total Affected Vendor : 1 | Products : 1
Solution
Update MantisBT to version 2.28.2 to fix an authenticated user XSS vulnerability.
  • Update MantisBT to version 2.28.2.
  • Verify the update is successful.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-40596 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-40596 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by [email protected]

    May. 22, 2026

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CWE CWE-79
    Added Reference https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d
    Added Reference https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
    Added Reference https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j
    Added Reference https://mantisbt.org/bugs/view.php?id=37011
    Added Reference https://mantisbt.org/bugs/view.php?id=37016
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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