CVE-2026-15407: Themify Builder authorization bypass in CSS and font management

CVE-2026-15407 · Severity: medium · CVSS 4.3 · Published 2026-07-16

Themify Builder, a popular page-building tool for WordPress, contains a security flaw that allows low-level users (like subscribers) to interfere with website design settings. An attacker can delete or overwrite the styling files for any post, including private drafts, and change global font settings. This could lead to unauthorized visual changes or the disruption of website content.

Technologies: Themify Builder. Vendors: Themify.

Quick answers

Is CVE-2026-15407 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-15407 being exploited in the wild.
How severe is CVE-2026-15407?
Medium severity, with a CVSS score of 4.3, published 16 July 2026.
Which products and versions are affected?
Themify Builder <= 7.7.7.
Is there a fix for CVE-2026-15407?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-15407 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-15407?
Check whether you run Themify Builder 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.

Technical details

The Themify Builder plugin for WordPress suffers from a missing authorization check (CWE-862) in its stylesheet management logic. Authenticated attackers with subscriber-level permissions or higher can exploit this to overwrite or delete generated CSS files for any post, including private or draft posts, and modify plugin-scoped font options. The attack is facilitated by the fact that the required CSRF nonce (tf_nonce) is exposed on public front-end pages via wp_localize_script, making it easily accessible to any logged-in user. The vulnerability is present in all versions up to and including 7.7.7.

Affected products

  • Themify Themify Builder <= 7.7.7

Timeline

  • 2026-07-16: disclosed
  • 2026-07-16: advisory

References

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