CVE-2026-77129: TYPO3-EXT-SA-2026-023: Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt)
The extension passes an editor-configurable email subject string directly into a Fluid template source without restriction. A backend user with edit access to the event plugin or Backend Module can supply Fluid ViewHelper syntax in this field to disclose sensitive data or execute TypoScript content objects. Exploitation of this issue requires an authenticated backend account with edit access to the event registration plugin or backend module.
Other sources
TYPO3-EXT-SA-2026-023: Server-Side Template Injection in extension "Event management and registration" (sfeventmgt)
— Packagist
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
composer/derhansen/sf_event_mgtto a version that resolves this vulnerability.Fixed in 9.0.3 - Upgrade
Upgrade
composer/derhansen/sf_event_mgtto a version that resolves this vulnerability.Fixed in 8.6.2 - Upgrade
Upgrade
composer/derhansen/sf_event_mgtto a version that resolves this vulnerability.Fixed in 7.9.3 - Upgrade
Upgrade
composer/derhansen/sf_event_mgtto a version that resolves this vulnerability.Fixed in 6.7.2 - Upgrade
Upgrade
composer/derhansen/sf_event_mgtto a version that resolves this vulnerability.Fixed in 5.9.3
Event History
Frequently Asked Questions
Who can exploit this issue?
An authenticated TYPO3 backend user who has edit access to the event registration plugin or its Backend Module can exploit it. The issue is not described as reachable by unauthenticated frontend visitors.
What level of access does an attacker need?
The attacker needs permission to edit the editor-configurable email subject field associated with the event plugin or Backend Module. They can place Fluid ViewHelper syntax in that field.
What could successful exploitation allow?
Successful exploitation can disclose sensitive data or execute TypoScript content objects. The reported impact affects confidentiality, integrity, and availability of the vulnerable component.