PT-2026-39900 · Mantisbt · Mantisbt

Published 2026-05-11 · Updated 2026-05-28 · CVE-2026-44657

Positive Technologies (AI Summary)

CVSS v4.0

7.5

High

Base vector

AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions MantisBT (affected versions not specified)

Description An attacker can execute code via stored cross-site scripting (XSS) by uploading a crafted XHTML attachment that references a JavaScript attachment. This is achieved by using the 'file download.php' endpoint with the show inline=1 parameter and a valid file show inline token CSRF token.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-44657

GHSA-P6FR-RXQ7-XCG8

Affected Products

Mantisbt

References · 10

• https://osv.dev/vulnerability/GHSA-p6fr-rxq7-xcg8 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-44657 · Security Note
• https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2 · Note
• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8 · Note
• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3 · Note
• https://github.com/mantisbt/mantisbt · Note
• https://reddit.com/r/VulnMatter/comments/1tb1tta/resumen_diario_de_vulnerabilidades_12052026 · Reddit Post
• https://mantisbt.org/bugs/view.php?id=37020 · Note
• https://twitter.com/dailycve/status/2053986304497525011 · Twitter Post
• https://twitter.com/vulert_official/status/2054123645325427062 · Twitter Post