# CVE-2026-77129

## Summary

- **CVE ID:** CVE-2026-77129
- **Severity:** HIGH
- **CVSS Score:** 7.7 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-1336
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 25, 2026

## 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.

## Affected Products

- TYPO3 — Extension "Event management and registration" (9.0.0)
- TYPO3 — Extension "Event management and registration" (8.0.0)
- TYPO3 — Extension "Event management and registration" (7.0.0)
- TYPO3 — Extension "Event management and registration" (6.0.0)
- TYPO3 — Extension "Event management and registration" (0)

## References

- [CNA](https://typo3.org/security/advisory/typo3-ext-sa-2026-023)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 14.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._