CVE-2026-103687 rhukster dom-sanitizer SVG Sanitization DOMSanitizer.php url incomplete blacklist
Attackers can bypass SVG sanitization via incomplete URL blacklisting to inject malicious scripts, requiring an upgrade to the dom-sanitizer library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103687?
CVE-2026-103687 is a medium-severity cross-site scripting vulnerability in rhukster dom-sanitizer, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been found in rhukster dom-sanitizer up to 1.0.15. The affected element is the function url of the file src/DOMSanitizer.php of the component SVG Sanitization. Such manipulation leads to incomplete blacklist. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.0.16 is sufficient to fix this issue. The name of the patch is 139c46c3d7c9bc81542b7b5a58d5cde5d0e0195a. Upgrading the affected component is recommended.
Which versions are affected by CVE-2026-103687?
How do I fix CVE-2026-103687?
No fix has been published for CVE-2026-103687 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-2026-103687 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103687 exists.
Sources
Also known as GHSA-cjfg-j8jp-5xvc, GHSA-xpxw-4f4p-f3h2.