CVE-2026-27369 HIGH

CVE-2026-27369: WordPress Celeste theme <= 1.3.6 - PHP Object Injection vulnerability

Vendor Boldthemes
Product Celeste
Weakness CWE-502 · Unsafe deserialization
Published March 5, 2026
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

Deserialization of Untrusted Data vulnerability in BoldThemes Celeste celeste allows Object Injection.This issue affects Celeste: from n/a through <= 1.3.6.

Explanation of Vulnerability in Simple Terms

02Summary

Celeste versions up to 1.3.6 contain a deserialization vulnerability that allows attackers to execute arbitrary code by sending a specially crafted network request. No authentication or user interaction is required. The vulnerability affects confidentiality, integrity, and availability of the affected system.

What an attacker can do

03Attacker Capabilities

Run their own code on the site without authentication.

Potential impact on your site

04Site Impact

Complete compromise of the site: data theft, malware injection, and service disruption.

Conditions required to exploit

05Prerequisites

Network access to the vulnerable Celeste installation; no authentication required.

Key dates

06Disclosure timeline

March 5, 2026 CVE published
April 28, 2026 Record updated