CVE-2026-77129Network attack vector

Sensitive data disclosure via Fluid subject injection

Published Aug 25, 2026 · Updated Aug 25, 2026

Server-side template injection in TYPO3 Event Management and Registration allows remote authenticated users to disclose data via email subjects. The editor-configurable email subject is passed unchanged into a Fluid template source, allowing injected ViewHelper syntax to be evaluated. Exploitation requires a backend account with permission to edit the event plugin or Backend Module; successful injection exposes server configuration, environment variables, and application source or executes TypoScript content objects.

CVSS severity7.7
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in TYPO3 Event Management and Registration allows remote authenticated users to disclose data via email subjects. The editor-configurable email subject is passed unchanged into a Fluid template source, allowing injected ViewHelper syntax to be evaluated. Exploitation requires a backend account with permission to edit the event plugin or Backend Module; successful injection exposes server configuration, environment variables, and application source or executes TypoScript content objects.

The record

CVE
CVE-2026-77129
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
in2code GmbH
Product
Event Management and Registration
Classifications
CWE-1336, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.9.3
  2. Affected versionversion=6.0.0 <6.7.2
  3. Affected versionversion=7.0.0 <7.9.3
  4. Affected versionversion=8.0.0 <8.6.2
  5. Affected versionversion=9.0.0 <9.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

in2code GmbH · Event Management and Registrationversion=0 <5.9.3; version=6.0.0 <6.7.2; version=7.0.0 <7.9.3; version=8.0.0 <8.6.2; version=9.0.0 <9.0.3

Published CVSS scores

7.7TYPO3CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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