# CVE-2026-120328: TYPO3 Mail extension authentication bypass in click tracking

Source: https://junglewise.ai/threats/cve-2026-120328-the-click-tracking-middleware-does-not-validate-the  
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-2026-120328 · Severity: info · Published 2026-11-03

The Mail extension for TYPO3 (a content management system) includes click tracking functionality that fails to require authentication when recipients access tracked links. An attacker can access personal data of newsletter subscribers by omitting the authentication code, potentially leading to exposure of email addresses, names, and other information embedded in newsletters.

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

## Quick answers

**Is CVE-2026-120328 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120328 being exploited in the wild.

**How severe is CVE-2026-120328?** 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-2026-120328?** 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-2026-120328 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-120328?** 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 does not validate the authentication code parameter when it is omitted from the request, resulting in broken access control. Unauthenticated attackers can directly access tracked links and retrieve personal data of newsletter recipients that is encoded in those links. This is a network-accessible vulnerability with no authentication or user interaction required.

## Affected products

- mediaessenz Mail 3.12.4 and below, 4.0.0 - 4.1.0

## Timeline

- 2026-11-03: disclosed
- 2026-11-03: advisory

## 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 open redirection in click tracking](https://junglewise.ai/threats/cve-2026-120327-the-click-tracking-middleware-accepts-an-arbitrary-target-url)