TYPO3-EXT-SA-2026-026: Broken Access Control in extension "Events 2" (events2)
It has been discovered that the extension "Events 2" (events2) is susceptible to two instances of Broken Access Control.
- Release Date: August 25, 2026
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Component: "Events 2" (events2)
- Composer Package Name: jweiland/events2
- Vulnerability Type: Broken Access Control
- Affected Versions: 10.2.11 and below
- Severity: High
- Suggested CVSS v4.0: AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- References: CVE-2026-77144, CVE-2026-77145, CWE-639, CWE-915
Problem Description
The frontend management plugin attributed a newly created event to the submitting user’s organizer record only when the request supplied no organizer of its own. The accompanying permission check confirmed only that the submitting user held any organizer role. A user with frontend event management access could therefore create an event that is attributed to another organizer. (CVE-2026-77144)
The permission check for the frontend management update flow verified a different event than the one the request went on to modify. A user with frontend event management access could therefore modify events belonging to other organizers. (CVE-2026-77145)
Solution
An updated version 10.2.12 is available from the TYPO3 extension manager, packagist and at
https://extensions.typo3.org/extension/download/events2/10.2.12/zip
Users of the extension are advised to update the extension as soon as possible.
Credits
Thanks to Seungbin Yang for reporting the vulnerabilities, and to Hoja Mustaffa Abdul Latheef for providing an updated version of the extension.
General Advice
Follow the recommendations that are given in the TYPO3 Security Guide.
