CVE-2026-42694: Themeum Kirki cross-site scripting vulnerability in HTML tag handling

CVE-2026-42694 · Severity: medium · CVSS 4.3 · Published 2026-10-29

Kirki is a customization framework for WordPress themes that allows developers to add settings panels. A cross-site scripting (XSS) vulnerability in the plugin allows attackers with subscriber-level access to inject malicious scripts that execute in the browsers of other users, potentially compromising site data and administration capabilities.

Technologies: Themeum Kirki. Vendors: Themeum.

Quick answers

Is CVE-2026-42694 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-42694 being exploited in the wild.
How severe is CVE-2026-42694?
Medium severity, with a CVSS score of 4.3, published 29 October 2026.
Which products and versions are affected?
Themeum Kirki through 6.4.0.
Is there a fix for CVE-2026-42694?
Yes: fixed in 6.4.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-42694 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-42694?
Check whether you run Themeum Kirki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: 6.4.1

Technical details

A content injection vulnerability exists in the improper neutralization of script-related HTML tags. An authenticated attacker with subscriber privileges can inject arbitrary HTML and scripts into pages; the vulnerability affects Kirki versions up to 6.4.0 and is fixed in 6.4.1.

Affected products

  • Themeum Kirki through 6.4.0

Timeline

  • 2026-10-29: disclosed
  • 2026-10-29: patched

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.