XSS in Projeqtor
CVE-2026-41466
ProjeQtor versions 7.0 through 12.4.3 contain a stored cross-site scripting vulnerability in the checkValidHtmlText() function within Security.php that fails to properly sanitize user input by only detecting specific patterns while returning unsanitized strings without output encoding. Attackers can inject malicious payloads that bypass the filter using alternative syntax such as img tags with event handlers, which are stored and executed in the browsers of users viewing the affected content.
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 (22.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% 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-2026-41466 (technical-description, exploit)
- gryfman.fr/cves/CVE-2026-41466 (technical-description, exploit)
- www.projeqtor.com (product)
- www.vulncheck.com/advisories/projeqtor-stored-xss-via-checkvalidhtmltext (third-party-advisory)
Frequently asked questions
- What is CVE-2026-41466?
- CVE-2026-41466 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-2026-41466?
- Medium severity. CVSS v3 base score is 5.4 out of 10.