CVE-2026-41466 ProjeQtor < 12.4.4 Stored XSS via checkValidHtmlText()
Attackers can inject malicious scripts via stored XSS in ProjeQtor, potentially leading to code execution or account takeover in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-41466?
CVE-2026-41466 is a medium-severity cross-site scripting vulnerability in ProjeQtor, published on 27 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-41466?
How do I fix CVE-2026-41466?
No fix has been published for CVE-2026-41466 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-41466 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41466 exists.
Sources
Also known as GHSA-8pgv-76j9-qj4g.