Description
Unauthenticated PHP Object Injection in Preservation <= 1.15 versions.
Published: 2026-10-29
Score: 9.8 Critical
EPSS: n/a
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

An unauthenticated PHP Object Injection flaw exists in all Preservation theme versions up to 1.15. By submitting specially crafted serialized data, an attacker can cause the theme to instantiate arbitrary PHP objects, which may lead to arbitrary code execution on the host server and full compromise of the WordPress site.

Affected Systems

Any WordPress site running the Preservation theme by ThemeREX, specifically versions 1.15 and older.

Risk and Exploitability

The CVSS score of 9.8 designates this vulnerability as critical. EPSS data is not available, and the issue is not currently listed in the CISA KEV catalog. The attack vector is inferred to be an unauthenticated HTTP request that includes the malicious serialized payload, enabling exploitation without user credentials.

Generated by OpenCVE AI on October 29, 2026 at 17:06 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade the Preservation theme to version 1.16 or later to remove the vulnerable code paths.
  • If an upgrade cannot be performed immediately, deactivate or uninstall the theme until a patched version is available.
  • Implement strict input validation on all serialized data handling within the theme or any related plugins to prevent accidental processing of crafted objects.
  • Enforce monitoring of web logs for attempts to inject serialized data and investigate anomalous requests promptly.

Generated by OpenCVE AI on October 29, 2026 at 17:06 UTC.

Tracking

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Advisories

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History

Thu, 29 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Description Unauthenticated PHP Object Injection in Preservation <= 1.15 versions.
Title WordPress Preservation theme <= 1.15 - PHP Object Injection vulnerability
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: Patchstack

Published:

Updated: 2026-10-29T15:25:13.652Z

Reserved: 2026-06-16T09:22:06.970Z

Link: CVE-2026-54859

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-29T16:18:10.097

Modified: 2026-10-29T16:20:19.663

Link: CVE-2026-54859

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T17:15:07Z

Weaknesses
  • CWE-502

    Deserialization of Untrusted Data