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Advisory record · GHSA-8x3j-439w-537c

TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector)

CVSS 9.2 CriticalCriticalEPSS 0.026 · 85th percentile

Critical, because:

  • CVSS score 9.2: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 19 May 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mmc/ceselectorPackagist>=6.0.0, <6.0.1 || >=5.0.0, <5.0.1 || >=4.0.0, <4.0.2 || <3.0.36.0.1, 5.0.1, 4.0.2, 3.0.3
Identifiers
GHSA-8x3j-439w-537c · CVE-2026-46725 · PKSA-kfm7-j6tb-2qn9
Weakness (CWE)
CWE-502
Tags
Published
19 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The TYPO3 "Content Element Selector" extension (Packagist mmc/ceselector) is vulnerable in versions before 3.0.3, from 4.0.0 before 4.0.2, from 5.0.0 before 5.0.1, and from 6.0.0 before 6.0.1. A remote, unauthenticated attacker can send a crafted cookie that the extension passes to PHP's unserialize() without safe handling, enabling PHP object injection and possible remote code execution on the TYPO3 server, but only when the content element is configured with Persistent Mode set to Static. Upgrade to version 3.0.3, 4.0.2, 5.0.1, or 6.0.1, matching your release line.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.2 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (TYPO3)
  • CISA KEV Not listed.
  • EPSS 0.026, the 85th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:03 UTC First seen by agentprime
  2. 31 Oct 2026, 14:03 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.