Remote Code Execution Vulnerability in TYPO3 Repository Extension
CVE-2026-77128

6.3MEDIUM

Key Information:

Vendor

Typo3

Status
Extension "event Management And Registration"
Vendor
CVE Published:
25 August 2026

What is CVE-2026-77128?

The TYPO3 Repository Extension contains a vulnerability that allows an unauthenticated remote user to bypass restrictions on querying event visibility. Specifically, if the disableOverrideDemand setting is not enabled, attackers can use a demand-override parameter to access hidden or time-restricted events, potentially exposing sensitive information. This vulnerability requires careful configuration management to mitigate the risk of unauthorized access.

Affected Version(s)

Extension "Event management and registration" 9.0.0 < 9.0.3

Extension "Event management and registration" 8.0.0 < 8.6.2

Extension "Event management and registration" 7.0.0 < 7.9.3

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-023
vendor-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Torben Hansen
.