CVE-2026-83545mediumCWE-79

CVE-2026-83545: medium-severity vulnerability in CoolClock

CoolClock < 4.3.8 - Contributor+ Stored XSS via Custom Skin JSON

Published

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33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 6.8epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Affected products
Unknown · CoolClock
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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CVE-2026-83546MEDIUMCoolClock < 4.3.8 - Contributor+ Stored XSS via Skin Class AttributeEPSS 0.4%