CVE-2021-36899: WordPress Asset CleanUp: Page Speed Booster plugin <= 1.3.8.4 - Authenticated Reflected Cross-Site Scripting (XSS) vulnerability

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-10-11 · updated 2026-06-17
Weakness: CWE-79

Description

Authenticated (admin+) Reflected Cross-Site Scripting (XSS) vulnerability in Gabe Livan's Asset CleanUp: Page Speed Booster plugin <= 1.3.8.4 at WordPress.

Affected products

Asset CleanUp: Page Speed Booster: before 1.3.8.5 — fixed in 1.3.8.5

How to fix

Upgrade to a fixed version: Asset CleanUp: Page Speed Booster 1.3.8.5. Check the vendor advisory for mitigations.

References

https://patchstack.com/database/vulnerability/wp-asset-clean-up/wordpress-asset-cleanup-page-speed-booster-plugin-1-3-8-4-authenticated-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
https://wordpress.org/plugins/wp-asset-clean-up/#developers
https://patchstack.com/database/vulnerability/wp-asset-clean-up/wordpress-asset-cleanup-page-speed-booster-plugin-1-3-8-4-authenticated-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
https://wordpress.org/plugins/wp-asset-clean-up/#developers

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