# CVE-2026-120327: TYPO3 Mail extension open redirection in click tracking

Source: https://junglewise.ai/threats/cve-2026-120327-the-click-tracking-middleware-accepts-an-arbitrary-target-url  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-120327 · Severity: info · Published 2026-11-03

The Mail extension for TYPO3, a PHP content management system, includes a click tracking feature that can redirect users to arbitrary external websites. An attacker can craft malicious links that exploit this flaw to redirect newsletter recipients to phishing sites or other malicious domains, potentially leading to credential theft or malware infection.

Technologies: [MediaEssenz Mail](https://junglewise.ai/threats/technologies/mediaessenz-mail). Vendors: [MediaEssenz](https://junglewise.ai/threats/vendors/mediaessenz).

## Quick answers

**Is CVE-2026-120327 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120327 being exploited in the wild.

**How severe is CVE-2026-120327?** Informational severity, published 3 November 2026.

**Which products and versions are affected?** MediaEssenz Mail 3.12.4 and below, 4.0.0–4.1.0.

**Is there a fix for CVE-2026-120327?** Yes: fixed in 3.12.5, 4.2.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120327 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-120327?** Check whether you run MediaEssenz Mail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.12.5, 4.2.0

## Technical details

The click tracking middleware in the Mail extension fails to validate the target URL before performing a redirect, allowing CWE-601 open redirection. An unauthenticated attacker can craft a tracking link with an arbitrary target URL and trick users into clicking it, bypassing same-origin restrictions. The vulnerability affects versions 3.12.4 and below, 4.0.0–4.1.0; patches are available in versions 3.12.5 and 4.2.0.

## Affected products

- mediaessenz Mail 3.12.4 and below, 4.0.0–4.1.0

## Timeline

- 2026-11-03: disclosed
- 2026-11-03: patched: versions 3.12.5 and 4.2.0 released

## References

- [https://packagist.org/](https://packagist.org/)
- [https://typo3.org/security/advisory/typo3-ext-sa-2026-037](https://typo3.org/security/advisory/typo3-ext-sa-2026-037)

## Related threats

- [TYPO3 Mail extension cross-site scripting in backend](https://junglewise.ai/threats/cve-2026-120332-the-html-content-of-mails-and-tracked-urls-are-rendered)
- [TYPO3 Mail extension broken access control in backend actions](https://junglewise.ai/threats/cve-2026-120330-backend-actions-and-ajax-routes-of-the-mail-module-do-not-check)
- [TYPO3 Mail extension authentication bypass in click tracking](https://junglewise.ai/threats/cve-2026-120328-the-click-tracking-middleware-does-not-validate-the)