CVE-2026-16559 YMC Filter < 3.12.9 - Author+ Stored XSS via SVG Icon Upload
Authors can upload malicious SVG files containing JavaScript, leading to stored XSS execution in the site's origin.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-16559?
CVE-2026-16559 is a medium-severity cross-site scripting vulnerability in Unknown YMC Filter, published on 8 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The YMC Filter WordPress plugin before 3.12.9 does not sanitize SVG files uploaded through one of its icon upload features and permits their upload by low-privileged users, allowing users with the Author role and above to upload a file containing JavaScript that executes in the site's origin when the file is viewed.
Weakness: CWE-79
Which versions are affected by CVE-2026-16559?
How do I fix CVE-2026-16559?
No fix has been published for CVE-2026-16559 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-2026-16559 being exploited?
There is no known exploitation of CVE-2026-16559 in the wild and no public exploit code.
Sources
Also known as GHSA-qgw2-v7vq-9g5r.