CVE-2026-40597

HIGH EPSS 38.9%
Published May 22, 20261mo ago · Modified Jun 17, 20262w ago
7.6 CVSS 4.0
High
Find Similar
Published May 22, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / HTML injection vulnerability, an attacker can bypass the Content Security Policy's script-src directive by uploading a crafted attachment to any issue that, when accessed via the file_download.php link, will be downloaded with a valid JavaScript MIME type resulting in script execution. The uploaded payload must be sniffed as a valid JavaScript MIME type by PHP finfo (see file_create_finfo() API function). Non-JavaScript MIME types will not get imported in a <script> tag by the browser, due to response header X-Content-Type-Options being set to nosniff, which requires all imported JavaScript files to be a valid JavaScript MIME type. This issue has been fixed in version 2.28.2.

CVSS Details

Base Score
7.6
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/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
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
38.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-358
CWE-79 Cross-site Scripting Injection

References 3

  • github.com https://github.com/mantisbt/mantisbt/commit/9e3bee2e7b909f4e3596985892b8bc8bee9e0bfe
  • github.com https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
  • mantisbt.org https://mantisbt.org/bugs/view.php?id=37016

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.