---
id: CVE-2026-54859
title: WordPress Preservation theme <= 1.15 - PHP Object Injection vulnerability
summary: Unauthenticated PHP Object Injection in Preservation <= 1.15 versions.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-502
vendor: ThemeREX
product: Preservation
affected:
  - Preservation >= n/a <= 1.15
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-29T19:40:16.181269Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T19:40:30.116Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-54859'
references:
  - url: >-
      https://patchstack.com/database/wordpress/theme/preservation/vulnerability/wordpress-preservation-theme-1-15-php-object-injection-vulnerability?_s_id=cve
tags:
  - cve.org
epss: 0.00526
epssPercentile: 0.44813
ingestedAt: '2026-11-01T23:03:55.476Z'
---

## Overview

Unauthenticated PHP Object Injection in Preservation <= 1.15 versions.

## Affected

- `Preservation >= n/a <= 1.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.