Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt) (CVE-2026-77129) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-77129

Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt)

Answer in brief

CVE-2026-77129 records a Unknown severity vulnerability in Server-Side Template Injection in extension "Event management and registration" (sf_event_mgt). The current sources do not mark it as known exploited. The current feed maps TYPO3/Extension "Event management and registration" (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TYPO3/Extension "Event management and registration" (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TYPO3/Extension "Event management and registration"generic	>=9.0.0 <9.0.3 \|\| >=8.0.0 <8.6.2 \|\| >=7.0.0 <7.9.3 \|\| >=6.0.0 <6.7.2 \|\| >=0 <5.9.3	9.0.3, 8.6.2, 7.9.3, 6.7.2, 5.9.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for TYPO3/Extension "Event management and registration".
Review the reported fix. Update TYPO3/Extension "Event management and registration" to 9.0.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Source referencetypo3.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.