Autoptimize <= 3.1.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via Google Fonts Optimization
- ID
- WPSEC-2026-1673
- Plugin
- Autoptimize (autoptimize)
- Affected
- all versions before 3.1.17
- Remediation
- Update to 3.1.17 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin High · Affected versions High among sites WPSec scans, 2026-10-27
- Attack surface
- Autoptimize on WPSec AttackSurface
- Fix released
- Published
Description
The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Google Fonts optimization feature in all versions up to, and including, 3.1.16 due to insufficient output escaping of the font-family string taken from Google Fonts URLs found in the page HTML. That string, which is URL-decoded for Google Fonts API v2 URLs, is placed without escaping into the href attribute of the combined Google Fonts <link> tag. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an affected page. Exploitation requires the Google Fonts option to be set to one of the non-default 'combine and link' or 'combine and preload' modes.
References
- https://wpsec.com/vuln/WPSEC-2026-1673/
- https://plugins.svn.wordpress.org/autoptimize/tags/3.1.17/
- https://wordpress.org/plugins/autoptimize/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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