CVE-2026-77129

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-08-25 09:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-26 17:13 UTC Last updatedMost recent change to the record

Details

Published

2026-08-25 09:17 UTC

Last modified

2026-08-26 17:13 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-1336

Record status

Deferred

Attack profile CVSS 4.0 · 7.7

Attack vector

Network

Complexity

Low

Attack requirements

Present

Privileges needed

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

High