What’s Vulnerable › Vulnerabilities

CVE-2026-44657: MantisBT: Stored XSS in File Download

• Severity: high (CVSS 7.5 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-07-21
• Weakness: CWE-79

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.

Affected products

• mantisbt: before 2.28.2

References

• https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
• https://mantisbt.org/bugs/view.php?id=37020

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