CVE-2026-41467: ProjeQtor < 12.4.4 Stored XSS via checkValidFileName()

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-27 · updated 2026-06-17
Weakness: CWE-79

Description

ProjeQtor versions 7.0 through 12.4.3 contain a stored cross-site scripting vulnerability in the file upload functionality where the checkValidFileName() function fails to restrict HTML and HTM file uploads. Authenticated attackers can upload HTML files containing arbitrary JavaScript through the image upload or attachment endpoints, and any user accessing the uploaded file URL will execute the embedded JavaScript in their browser.

Affected products

ProjeQtor: from 7.0 through 12.4.3

References

https://damiri.fr/en/cves/CVE-2026-41467
https://gryfman.fr/cves/CVE-2026-41467
https://www.projeqtor.com
https://www.vulncheck.com/advisories/projeqtor-stored-xss-via-checkvalidfilename

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