CVE-2026-12089: Aurelienlws Lws Optimize – All-In-One Speed Booster & Cache Tools

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

The LWS Optimize – All-in-One Speed Booster & Cache Tools plugin for WordPress is vulnerable to Arbitrary File Read in versions up to, and including, 3.3.19. This is due to the combine_current_css() function trusting <link rel="stylesheet" href="..."> values harvested from page HTML and converting same-site URLs to absolute filesystem paths before reading them with file_get_contents()/Minify\CSS::add(), without enforcing that the resolved path stay within ABSPATH or have a .css extension. This makes it possible for authenticated attackers, with Editor-level access and above, to read arbitrary files.

Affected products

• Aurelienlws Lws Optimize – All-In-One Speed Booster & Cache Tools: up to and including 3.3.19

Published 2026-06-13. Last modified 2026-07-23.