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CVE-2026-75891

8.8, high

Themeum Kirki - Freeform Page Builder, Website Builder & Customizer Deserialization of Untrusted Data Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 23.2% of scored CVEs
Exploitation
No public evidence
Published
27 Oct 20262 days ago

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.

Details

Vendor
Themeum
Product
Kirki - Freeform Page Builder, Website Builder & Customizer
Weakness
CWE-502 (opens in a new tab)
Status
Deferred
Updated
27 Oct 2026
Assigner
security@wordfence.com

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

References 2

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Themeum CVEs

Every Themeum CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-104734 Themeum Kirki - Freeform Page Builder, Website Builder & Customizer Deserialization of Untrusted Data Vulnerability EPSS 0.5% 7.2, high
  • CVE-2026-107762 Themeum Kirki - Freeform Page Builder, Website Builder & Customizer Authorization Bypass Through User-Controlled Key Vulnerability EPSS 0.4% 7.5, high

Beyond this page

Is CVE-2026-75891 in your network?

This page tells you how dangerous CVE-2026-75891 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-75891 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 29 Oct 2026, not the live upstream state.