MantisBT: Stored XSS in print_all_bug_page_word.php

published 2026-07-15 3mo ago modified 2026-07-15 3mo ago also GHSA-h2wf-967x-gxvw

cvss: —; not scored
cisa kev: Not listed; not in CISA's catalog
epss: —; no EPSS score yet
public exploits: 0; none known

A missing output encoding call in print_all_bug_page_word.php allows any authenticated user to inject arbitrary HTML into an IMG tag's *alt* attribute via an image attachment with a crafted filename such as `probe." onload="alert(1)`.

When any user views the HTML export page (print_all_bug_page_word.php?type_page=html&export=1), the rendered IMG tag becomes `<img src="..." alt="" onload="alert(1)" />`, breaking out of the alt attribute.

### Impact Cross-site scripting.

Impact is limited by MantisBT's Content Security Policy.

### Patches - https://github.com/mantisbt/mantisbt/commit/bdd0e364f62759de272dfd4c89b4f51d27be9daa

### Workarounds None

### Resources - https://mantisbt.org/bugs/view.php?id=37234

### Credits MantisBT thanks the [Dracosec Research Limited](https://dracosec.tech/) team (Chris Chan, Krecendo Hui, William Lam) for discovering and responsibly reporting the issue.

Patch / fix

fixed in 1 links 1

packagist mantisbt/mantisbt 2.28.4

github.com/mantisbt/mantisbt@bdd0e36 commit

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Affected packages

ecosystem	package	affected	fixed in
packagist	mantisbt/mantisbt	<2.28.4	2.28.4

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

GitHub Advisory GHSA-h2wf-967x-gxvw

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