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CVE-2026-77145 TYPO3 CVE debrief

CVE-2026-77145 debrief based on CVE Program and NVD records. The vulnerability is a permission check issue in the frontend management update flow of an event management system. This allows users with frontend event management access to modify events belonging to other organizers. The issue has a high severity with a CVSS score of 7.1. Defenders should assess exposure, verify patching, and restrict access to minimize potential impact. The CVE record was published on 2026-08-25T09:17:35.667Z and has not been modified since then.

Vendor
TYPO3
Product
Extension "Events 2"
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-25
Original CVE updated
2026-09-28
Advisory published
2026-08-25
Advisory updated
2026-09-28

Who should care

Users with frontend event management access, system administrators, and security teams responsible for event management systems should be aware of this vulnerability. These stakeholders need to assess their exposure, verify patching status, and implement necessary restrictions to prevent unauthorized event modifications.

Why it matters

CVE-2026-77145 is a high-severity vulnerability in an event management system, allowing users with frontend access to modify events of other organizers. Defenders should assess exposure, verify patching, and restrict access to minimize potential impact.

  • Potential unauthorized event modifications by users with frontend access
  • Need to verify patching and restrict frontend access to minimize impact
  • Monitoring event changes for detection of potential abuse

Technical summary

A permission check issue in the frontend management update flow allowed users with frontend event management access to modify events belonging to other organizers. This issue arises from a flawed verification process that checks a different event than the one being modified. The vulnerability impacts event management systems, enabling unauthorized modifications by users with frontend access.

Defensive priority

Assess exposure and verify patching for users with frontend event management access

Recommended defensive actions

  • Verify patching and update status for the affected system
  • Restrict frontend event management access to minimize potential impact
  • Monitor event modifications for unauthorized changes

Evidence notes

Official CVE Program and NVD records indicate a permission check issue in an event management system, allowing users with frontend access to modify events of other organizers

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77145 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77145

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-77145 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77145

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://typo3.org/security/advisory/typo3-ext-sa-2026-026

    f4fb688c-4412-4426-b4b8-421ecf27b14a

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.