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CVE-2026-75891— Kirki <= 6.2.5 - Authenticated (Subscriber+) PHP Object Injection to Administrator Account Takeover via 'get-single-symbol' AJAX Endpoint

Quick assessment

Affected
themeum Kirki – Freeform Page Builder, Website Builder & Customizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Kirki 插件在所有 6.2.5 及更早版本中存在权限提升漏洞，该漏洞源于 PHP 对象注入。具体原因是：在 AJAX 分发器的 分支中，对不可信输入进行了反序列化操作，且缺少应有的权限检查。这使得拥有“订阅者”（Subscriber）及以上权限的已认证攻击者能够注入 PHP 对象。由于还存在利用链（POP chain），攻击者可借此覆盖管理员密码，从而获取管理员权限。

CVSS 8.8 · High
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I. Basic Information for CVE-2026-75891

Vulnerability Information
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Vulnerability Title
Kirki <= 6.2.5 - Authenticated (Subscriber+) PHP Object Injection to Administrator Account Takeover via 'get-single-symbol' AJAX Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
The Kirki plugin for WordPress is vulnerable to Privilege Escalation via PHP Object Injection in all versions up to, and including, 6.2.5 via deserialization of untrusted input through the 'get-single-symbol' branch of the kirki_post_apis() AJAX dispatcher due to a missing capability check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to overwrite an administrator's password and gain administrative access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
themeum Kirki – Freeform Page Builder, Website Builder & Customizer 0 ~ 6.2.5 -

II. Public POCs for CVE-2026-75891

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III. Intelligence Information for CVE-2026-75891

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Other References for CVE-2026-75891 (2)

IV. Related Vulnerabilities

Same product: Kirki – Freeform Page Builder, Website Builder & Customizer
Same vendor: themeum
Same weakness: CWE-502