CVE-2026-83545
Received Received - Intake

Stored XSS in CoolClock WordPress Plugin

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: WPScan

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.

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Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-11
AI Q&A
2026-09-11
EPSS Evaluated
N/A
NVD
CVE-2026-83545
EUVD
EUVD-2026-75956

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
coolclock coolclock to 4.3.8 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in the CoolClock WordPress plugin versions below 4.3.8. It allows users with contributor-level access or higher to inject malicious JavaScript through a custom skin setting. The plugin fails to escape this setting properly before outputting it in an inline script, causing the injected code to execute when viewed by others.

Detection Guidance

Check if the CoolClock WordPress plugin version is below 4.3.8. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files for version details. Look for unauthorized JavaScript injections in the custom skin settings.

Impact Analysis

An attacker with contributor access could inject JavaScript that steals cookies, session tokens, or sensitive data from other users viewing the affected content. It could also redirect users to malicious sites or perform actions on their behalf without consent.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations may face compliance penalties if user data is compromised through this flaw.

Mitigation Strategies

Update the CoolClock plugin to version 4.3.8 or later immediately. Remove or disable the plugin if an update is not available. Review user roles with contributor-level access or higher for suspicious activity.

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