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Vulnerability · Published May 22, 2026 · Assigned by GitHub_M

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

High 7.2

In plain English

A high-severity cross-site scripting in mantisbt from mantisbt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.2High
Exploit odds (30 days)0.4%top 63.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistmantisbt/mantisbt2.28.2GHSA-j3v9-553h-x28j

Affected products (as reported)

VendorProductVersions
mantisbt mantisbt >= 2.11.0, < 2.28.2

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L

References