MantisBT: Reflected XSS in admin/install.php via unescaped printf

Date Jul 15, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Composer · mantisbt/mantisbt

CVE CVE-2026-52881

Critical vendor advisory CVE-2026-52881

Summary

MantisBT: Reflected XSS in admin/install.php via unescaped printf

Why it matters

GitHub has published a reviewed security advisory for mantisbt/mantisbt. Prioritize it with other application dependency updates.

Operator check

Check whether mantisbt/mantisbt is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.2.

Sources

GitHub Advisory GHSA-vcrw-4xvv-jh49 NVD — CVE-2026-52881 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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