CVE-2026-78531: CWE-502 Deserialization of Untrusted Data in ThemeREX Jacqueline
Description
CVE-2026-78531 is a critical unauthenticated PHP Object Injection vulnerability in ThemeREX Jacqueline versions up to 2.22. This vulnerability involves deserialization of untrusted data, which can lead to full compromise of confidentiality, integrity, and availability without requiring authentication.
CVSS v3.1
Score 9.8critical
Affected software
ThemeREX
Jacqueline
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-78531 is a vulnerability classified as CWE-502 (Deserialization of Untrusted Data) affecting ThemeREX Jacqueline versions up to and including 2.22. It allows unauthenticated attackers to perform PHP Object Injection by sending crafted input that is deserialized by the application, potentially enabling remote code execution or other severe impacts. The CVSS v3.1 score is 9.8, indicating critical severity with network attack vector, low attack complexity, no privileges required, no user interaction, and full impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability can lead to complete system compromise, including remote code execution, data disclosure, data modification, and denial of service. Because no authentication is required, attackers can exploit this remotely over the network without user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid exposing affected versions to untrusted networks or inputs. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Patchstack
- Date Reserved
- 2026-08-24T17:28:20.060Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aca96c12cdf04f6564a6050
Added to database: 10/10/2026, 19:49:21 UTC
Last enriched: 10/10/2026, 20:03:27 UTC
Last updated: 10/10/2026, 20:08:17 UTC
Views: 10
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