What’s Vulnerable › Vulnerabilities

CVE-2026-12089: WS Optimize – All-in-One Speed Booster & Cache Tools <= 3.3.19 - Authenticated (Editor+) Arbitrary File Read

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-13 · updated 2026-07-23
• Weakness: CWE-22

Description

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: through 3.3.19

References

• https://plugins.trac.wordpress.org/browser/lws-optimize/tags/3.3.19/Classes/Front/LwsOptimizeCSSManager.php#L289
• https://plugins.trac.wordpress.org/browser/lws-optimize/tags/3.3.19/Classes/Front/LwsOptimizeCSSManager.php#L61
• https://www.wordfence.com/threat-intel/vulnerabilities/id/5cb80db2-753c-40fa-aee4-7d8c1749d037?source=cve

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