Medium severity · published Sep 11, 2026
CVE-2026-83546
CoolClock < 4.3.8 - Contributor+ Stored XSS via Skin Class Attribute
6.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
CoolClock ·
before 4.3.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83546
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83546
wpscan.com
https://wpscan.com/vulnerability/57fcdde1-1723-42e1-a6d0-16e63a532ac7/
More from CoolClock
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CVE-2026-83545
CoolClock < 4.3.8 - Contributor+ Stored XSS via Custom Skin JSON