XSS in Projeqtor
CVE-2026-41467
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Projeqtor — versions 7.0, 12.4.4
Weakness classification (CWE)
References
- damiri.fr/en/cves/CVE-2026-41467 (technical-description, exploit)
- gryfman.fr/cves/CVE-2026-41467 (technical-description, exploit)
- www.projeqtor.com (product)
- www.vulncheck.com/advisories/projeqtor-stored-xss-via-checkvalidfilename (third-party-advisory)
Frequently asked questions
- What is CVE-2026-41467?
- CVE-2026-41467 is a medium-severity vulnerability in Projeqtor, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-27.
- How severe is CVE-2026-41467?
- Medium severity. CVSS v3 base score is 5.4 out of 10.