CVE-2026-44657
MantisBT Vulnerable to Stored XSS in File Download
EPSS 0.07%
Description
Using *show_inline=1* parameter and a valid *file_show_inline_token* CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment. ### Impact Cross-site scripting ### Patches - 26647b2e68ba30b9d7987d4e03d7a16416684bc2 ### Workarounds None ### Credits Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.
How to fix CVE-2026-44657
To remediate CVE-2026-44657, upgrade the affected package to a fixed version below.
- —upgrade to 2.28.2 or later
Is CVE-2026-44657 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.28.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N |