CVE-2026-83546

CoolClock < 4.3.8 - Contributor+ Stored XSS via Skin Class Attribute

The CoolClock WordPress plugin before 4.3.8 does not properly escape a skin setting before outputting it within an HTML attribute, allowing users with contributor-level access and above to inject arbitrary web scripts that execute when the content is viewed.

Affected

CoolClock

CVSS v3.1 CNA

6.8 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

EPSS

0.43% chance of exploitation in the next 30 days, 36th percentile

Published

2026-09-11

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/57fcdde1-1723-42e1-a6d0-16e63a532ac7/

References

• CVE Record
• NVD entry