CVE-2026-83545 CoolClock < 4.3.8 - Contributor+ Stored XSS via Custom Skin JSON
Contributors can inject arbitrary JavaScript via custom skin settings in CoolClock, leading to stored XSS when viewed.
- 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-2026-83545?
CVE-2026-83545 is a medium-severity cross-site scripting vulnerability in Unknown CoolClock, published on 11 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The CoolClock WordPress plugin before 4.3.8 does not properly escape a custom skin setting before outputting it inside an inline script, allowing users with contributor-level access and above to inject arbitrary JavaScript that executes when the content is viewed.
Weakness: CWE-79
Which versions are affected by CVE-2026-83545?
How do I fix CVE-2026-83545?
No fix has been published for CVE-2026-83545 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-2026-83545 being exploited?
There is no known exploitation of CVE-2026-83545 in the wild and no public exploit code.
Sources
Also known as GHSA-rp7h-v4qm-gcfw.