What’s Vulnerable › Vulnerabilities
CVE-2026-83545: CoolClock < 4.3.8 - Contributor+ Stored XSS via Custom Skin JSON
- Severity: medium (CVSS 6.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-11 · updated 2026-09-11
- Weakness: CWE-79
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.
Affected products
- CoolClock: before 4.3.8 — fixed in 4.3.8
How to fix
Upgrade to a fixed version: CoolClock 4.3.8. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-83545 or the next vulnerability affects your stack