High severity · published May 28, 2026
CVE-2026-44657
MantisBT: Stored XSS in File Download
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Prior to 2.28.2, 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. This vulnerability is fixed in 2.28.2.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
mantisbt · mantisbt
< 2.28.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44657
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44657
github.com
https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
github.com
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
github.com
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
mantisbt.org
https://mantisbt.org/bugs/view.php?id=37020
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