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CVE-2026-77129

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

HIGH
7.7
CVSS Score
Published: August 25, 2026 at 09:00 AM UTC
Updated: August 26, 2026 at 05:31 PM UTC
2 products affected across 2 vendorsEvent Management and RegistrationEvent management and registration

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Severity
HIGH7.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Event Management and Registration· Derhansentypo3
75%
All versions
Event management and registration· TYPO3composer
60%
v < 5.9.36.0.0 ≤ v < 6.7.27.0.0 ≤ v < 7.9.38.0.0 ≤ v < 8.6.29.0.0 ≤ v < 9.0.36.0.07.0.08.0.09.0.0
Affected range stops below 5.9.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.7.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.9.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.6.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://typo3.org/security/advisory/typo3-ext-sa-2026-023

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHTYPO3
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-1336

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