Reported vulnerability

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

Q: Which versions of LWS Optimize – All-in-One Speed Booster & Cache Tools are affected?

Wordfence lists these affected versions: Start version unspecified, through 3.3.19. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for LWS Optimize – All-in-One Speed Booster & Cache Tools?

Wordfence reports a fix for this issue in LWS Optimize – All-in-One Speed Booster & Cache Tools. It lists these fixed versions: 3.3.20. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 12 Jun 2026

Updated 13 Jun 2026

CVE-2026-12089

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 4.9

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 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.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

LWS Optimize – All-in-One Speed Booster & Cache Tools

Software: plugin · lws-optimize
Affected versions: Start version unspecified, through 3.3.19
Fix availability: Fix available
Fixed versions: 3.3.20

Recommended action

Update to version 3.3.20, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/5cb80db2-753c-40fa-aee4-7d8c1749d037?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of LWS Optimize – All-in-One Speed Booster & Cache Tools are affected?

Wordfence lists these affected versions: Start version unspecified, through 3.3.19. Use the version checker above to compare your installed release with this report.

Is a fix available for LWS Optimize – All-in-One Speed Booster & Cache Tools?

Wordfence reports a fix for this issue in LWS Optimize – All-in-One Speed Booster & Cache Tools. It lists these fixed versions: 3.3.20. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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