CVE-2026-120327: TYPO3-EXT-SA-2026-037: Open Redirection in extension "Mail" (mail)

Q: Who can exploit this issue?

An unauthenticated remote attacker can exploit it by getting a user to follow a crafted click-tracking link on a site using the affected Mail extension. User interaction is required because the victim must click the link.

Q: What is the practical impact?

The vulnerable middleware can redirect visitors from a trusted website link to an arbitrary external URL. This can make phishing or other malicious destinations appear more trustworthy because the link begins on the legitimate site.

Q: What should be checked while remediation is pending?

Review click-tracking links generated or handled by the Mail extension, especially links whose target URL points to an unexpected external domain. Limit distribution of untrusted tracking links where possible until the issue is addressed.

Published Nov 3, 2026

Updated

The click tracking middleware accepts an arbitrary target URL and redirects to it. Attackers can misuse links to the website to redirect users to external sites.

Other sources

TYPO3-EXT-SA-2026-037: Open Redirection in extension "Mail" (mail)

— Packagist

Affected Software

2 affected componentsFixes available

composer/mediaessenz/mail>=4.0.0, <4.2.0

4.2.0

composer/mediaessenz/mail<3.12.5

3.12.5

Event History

Nov 3, 2026

Advisory Published

via Packagist·09:00 AM

Data Sourced

via Packagist·09:00 AM

DescriptionSeverityAffected Software

CVE Published

via MITRE·09:56 AM

Data Sourced

via MITRE·09:56 AM

DescriptionWeakness

Data Sourced

via NVD·10:17 AM

DescriptionSeverityWeakness

Frequently Asked Questions

Who can exploit this issue?

An unauthenticated remote attacker can exploit it by getting a user to follow a crafted click-tracking link on a site using the affected Mail extension. User interaction is required because the victim must click the link.

What is the practical impact?

The vulnerable middleware can redirect visitors from a trusted website link to an arbitrary external URL. This can make phishing or other malicious destinations appear more trustworthy because the link begins on the legitimate site.

What should be checked while remediation is pending?

Review click-tracking links generated or handled by the Mail extension, especially links whose target URL points to an unexpected external domain. Limit distribution of untrusted tracking links where possible until the issue is addressed.

CVE-2026-120327: TYPO3-EXT-SA-2026-037: Open Redirection in extension "Mail" (mail)

Other sources

Affected Software

Event History

Frequently Asked Questions

Who can exploit this issue?

What is the practical impact?

What should be checked while remediation is pending?

Company

Resources

Contact

Frequently Asked Questions

Who can exploit this issue?

What is the practical impact?

What should be checked while remediation is pending?