CoolClock < 4.3.8 - Contributor+ Stored XSS via Custom Skin JSON
Priority LOW 30CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00431 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed CoolClock (Unknown): 4.3.8
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | CoolClock | before 4.3.8 | 4.3.8 | Patch available | CNA |
- CoolClock VendorUnknown Affected before 4.3.8 Fixed in 4.3.8 Patch available CNA
Remediation
- Fix · CNA CoolClock (Unknown) Fixed in 4.3.8
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
CoolClock 4.3.8
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-57682 CoolClock < 4.3.8 - Contributor+ Stored XSS via Skin Class AttributePriority LOW 30
Timeline
- 2026-10-02 Threatist record created from CVE-2026-83545
- 2026-10-03 Alias added: GHSA-rp7h-v4qm-gcfw
References
Sources
- CVE-2026-83545 · CVE Program
- CVE-2026-83545 · NVD
- FIRST EPSS
- GHSA-rp7h-v4qm-gcfw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences