CVE-2026-66563: CWE-502 Deserialization of Untrusted Data in ThemeREX Windsor
Description
CVE-2026-66563 is a critical vulnerability in ThemeREX Windsor versions up to 2.10 that allows unauthenticated PHP Object Injection due to deserialization of untrusted data. This flaw can lead to full compromise of confidentiality, integrity, and availability of the affected system.
CVSS v3.1
Score 9.8critical
Affected software
ThemeREX
Windsor
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-502, involves unsafe deserialization in ThemeREX Windsor versions up to and including 2.10. An attacker can exploit this flaw without authentication by injecting malicious PHP objects, potentially leading to remote code execution or other severe impacts. The CVSS v3.1 score is 9.8, reflecting its critical severity with network attack vector, no privileges required, and no user interaction needed.
Potential Impact
Successful exploitation can result in complete system compromise, including unauthorized disclosure, modification, or destruction of data, and disruption of service. The vulnerability affects confidentiality, integrity, and availability at a high level.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to vulnerable installations and monitor for suspicious activity related to PHP object injection attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Patchstack
- Date Reserved
- 2026-07-27T13:59:48.657Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aca96bf2cdf04f6564a5c6e
Added to database: 10/10/2026, 19:49:19 UTC
Last enriched: 10/10/2026, 20:03:52 UTC
Last updated: 10/10/2026, 20:28:10 UTC
Views: 7
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