MantisBT XSS when uploading an attachment

published 2020-03-19 6y ago modified 2026-06-17 4mo ago also GHSA-p495-jrpq-p66g , EUVD-2019-6522

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

The proj_doc_edit_page.php Project Documentation feature in MantisBT before 2.21.3 has a stored cross-site scripting (XSS) vulnerability, allowing execution of arbitrary code (if CSP settings permit it) after uploading an attachment with a crafted filename. The code is executed when editing the document's page.

Patch / fix

fixed in 2 links 1

packagist mantisbt/mantisbt 2.21.3
mantisbt mantisbt 2.21.3

github.com/mantisbt/mantisbt@bd094de commit

Is CVE-2019-15539 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	mantisbt/mantisbt	<2.21.3	2.21.3

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /mantisbt/mantisbt/commit/bd094dede74ff6e313e286e949e2387233a96eea
web, patch, third-party-advisory
mantisbt.org /bugs/view.php?id=26078
web, permissions-required, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2019-15539
advisory
github.com /mantisbt/mantisbt
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.