CVE-2026-103686 rhukster dom-sanitizer URL Validation DOMSanitizer.php isDangerousUrl cross site scripting
Remote attackers can execute arbitrary scripts via a flaw in URL validation within the rhukster dom-sanitizer library.
- 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-2026-103686?
CVE-2026-103686 is a medium-severity cross-site scripting vulnerability in rhukster dom-sanitizer, published on 1 Oct 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
A flaw has been found in rhukster dom-sanitizer up to 1.0.15. Impacted is the function DOMSanitizer::isDangerousUrl of the file src/DOMSanitizer.php of the component URL Validation. This manipulation causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been published and may be used. Upgrading to version 1.0.16 is recommended to address this issue. Patch name: 4623b565d060bc02ca5a07d8c8241fe28e2edfda. It is suggested to upgrade the affected component.
Which versions are affected by CVE-2026-103686?
How do I fix CVE-2026-103686?
No fix has been published for CVE-2026-103686 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-2026-103686 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103686 exists.
Sources
Also known as GHSA-mrpv-6x26-mf6c, GHSA-qjw9-86r9-fqqc.