MantisBT is vulnerable to XSS and potential account takeover via user font family preference update
Priority LOW 32CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00424 36th percentileScored 2026-11-07
Fix Fixed mantisbt (mantisbt): 2.28.2mantisbt/mantisbt (Packagist): 2.28.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| mantisbt | mantisbt | 2.11.0 to before 2.28.2 | 2.28.2 | Patch available | CNA |
| — | mantisbt/mantisbt (Packagist) | 2.11.0 to before 2.28.2 | 2.28.2 | Patch available | GHSA-j3v9-553h-x28j |
- mantisbt Vendormantisbt Affected 2.11.0 to before 2.28.2 Fixed in 2.28.2 Patch available CNA
- mantisbt/mantisbt (Packagist) Vendor— Affected 2.11.0 to before 2.28.2 Fixed in 2.28.2 Patch available GHSA-j3v9-553h-x28j
Remediation
- Fix · CNA mantisbt (mantisbt) Fixed in 2.28.2
- Fix · GHSA-j3v9-553h-x28j mantisbt/mantisbt (Packagist) Fixed in 2.28.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40596
- 2026-10-03 Alias added: GHSA-j3v9-553h-x28j
References
Other 6
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
- https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d
- https://mantisbt.org/bugs/view.php?id=37011
- https://mantisbt.org/bugs/view.php?id=37016
- https://github.com/mantisbt/mantisbt
More mantisbt vulnerabilities
- TI-2017-05251 MantisBT through 2.3.0 allows arbitrary password reset and unauthenticated admin access… CVSS 3.1HIGH 8.8
- TI-2026-29334 MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page CVSS 4.0MEDIUM 6.9
- TI-2014-05966 The XmlImportExport plugin in MantisBT 1.2.17 and earlier allows remote attackers to… CVSS 2.0HIGH 7.5
- TI-2026-27192 MantisBT Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked CVSS 4.0MEDIUM 5.3
- TI-2026-25495 MantisBT: Authorization Bypass in Global Profile Creation CVSS 4.0MEDIUM 5.3
- TI-2026-26676 MantisBT: Privilege Escalation from Manager to Administrator CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-40596 · CVE Program
- CVE-2026-40596 · NVD
- FIRST EPSS
- GHSA-j3v9-553h-x28j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences