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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00234.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
TYPO3 Extension "Event management and registration" unaffected
Version Status Constraints
9.0.0 affected < 9.0.3
8.0.0 affected < 8.6.2
7.0.0 affected < 7.9.3
6.0.0 affected < 6.7.2
0 affected < 5.9.3

No data.

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://typo3.org/security/advisory/typo3-ext-sa-2026-023 cve-icon cve-icon
History

Tue, 25 Aug 2026 09:15:00 +0000

Type Values Removed Values Added
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.
Title Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt)
Weaknesses CWE-1336
References
Metrics cvssV4_0

{'score': 7.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: TYPO3

Published:

Updated: 2026-08-25T09:00:44.104Z

Reserved: 2026-08-20T13:10:12.062Z

Link: CVE-2026-77129

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-25T09:17:33.200

Modified: 2026-08-25T09:17:33.200

Link: CVE-2026-77129

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T10:30:05Z

Weaknesses