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9.4

Event management extension lets editors run code via email subject

CVE-2026-77129 · published 2 months ago
Summary

The Event Management and Registration extension allows a backend user who can edit event settings to place special template code into the email subject field. This code is processed by the system, potentially exposing private information or running unwanted actions. Limit editing rights to trusted users and update the extension to a version that sanitizes the email subject input.

What to do
  • Update typo3 extension "event management and registration" to version 9.0.3 or later.
Affected software
VendorProductAffected versions
typo3 extension "event management and registration" < 9.0.3
Original advisory text
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
Timeline
Published25 Aug 2026
Updated4 Nov 2026
First seen25 Aug 2026
Sources
CVE-2026-77129 · NVD
CVE-2026-77129 · MITRE
CVE-2026-77129 · OSV
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