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CVE-2026-40596

31
FAUCET Score

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.

First published: May 22, 2026Last modified: May 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
MantisbtMantisbt
>= 2.11.0, < 2.28.2CNA affected

CVSS Data

CVSS version used by this source: 4.0

7.2HIGH

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/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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
PASSIVE
VS Confidentiality
HIGH
VS Integrity
LOW
VS Availability
LOW
SS Confidentiality
HIGH
SS Integrity
HIGH
SS Availability
LOW
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 44th percentile among its peer group of 890 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: mantisbt/mantisbtFixed in: 2.28.2

Vendor Advisories (1)

composerGHSA-j3v9-553h-x28jhigh

MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference

May 11, 2026

References

github.com / mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d
github.com / mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
github.com / mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j
mantisbt.org / bugs/view.php
mantisbt.org / bugs/view.php