CVE-2026-77129 Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt)
Authenticated backend users can inject Fluid template code to disclose data or execute TypoScript objects in the Event management extension.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77129?
CVE-2026-77129 is a high-severity code injection vulnerability in TYPO3 Extension "Event management and registration", published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-1336
Which versions are affected by CVE-2026-77129?
How do I fix CVE-2026-77129?
No fix has been published for CVE-2026-77129 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-77129 being exploited?
There is no known exploitation of CVE-2026-77129 in the wild and no public exploit code.
Sources
Also known as GHSA-j8g2-q9pf-89w3.