---
title: "CVE-2026-46725: TYPO3 Remote Code Execution in extension \"Content Element Selector\" (ceselector)"
url: https://erroneo.us/security/cve/CVE-2026-46725/
description: "CVE-2026-46725 (mmc/ceselector (Composer (PHP))): The extension passes an attacker-controlled cookie directly to PHP's unserialize() without safely…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-19
date_modified: 2026-06-29
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-46725"
kev: false
cvss: 9.2
epss: 0.01859
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-46725: TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector)

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.9% , percentile 79: FIRST’s model estimates a 1.9% chance of exploitation activity in the next 30 days, higher than 79% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes mmc/ceselector (Composer (PHP)) >= 6.0.0, < 6.0.1, fixed in 6.0.1 ; mmc/ceselector (Composer (PHP)) >= 5.0.0, < 5.0.1, fixed in 5.0.1 ; mmc/ceselector (Composer (PHP)) >= 4.0.0, < 4.0.2, fixed in 4.0.2 ; mmc/ceselector (Composer (PHP)) < 3.0.3, fixed in 3.0.3 . Check your lockfile, including transitive dependencies.

## What it is

The extension passes an attacker-controlled cookie directly to PHP's unserialize() without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with "Persistent Mode: Static" in the plugin settings.

## Affected packages

- Composer (PHP) `mmc/ceselector` >= 6.0.0, < 6.0.1 → fixed: 6.0.1
- Composer (PHP) `mmc/ceselector` >= 5.0.0, < 5.0.1 → fixed: 5.0.1
- Composer (PHP) `mmc/ceselector` >= 4.0.0, < 4.0.2 → fixed: 4.0.2
- Composer (PHP) `mmc/ceselector` < 3.0.3 → fixed: 3.0.3

## Affected products (CVE record)

- TYPO3 Extension "Content Element Selector": 6.0.0 < 6.0.1, 5.0.0 < 5.0.1, 4.0.0 < 4.0.2, < 3.0.3

## Severity

- TYPO3 CVSS 4.0: 9.2 `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`
- GitHub CVSS 4.0: 9.2 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.86% probability of exploitation activity in the next 30 days; percentile 79.

## Sources

- [typo3.org](https://typo3.org/security/advisory/typo3-ext-sa-2026-013)
- [GitHub Advisory GHSA-8x3j-439w-537c](https://github.com/advisories/GHSA-8x3j-439w-537c)
- [CVE.org record CVE-2026-46725](https://www.cve.org/CVERecord?id=CVE-2026-46725)
- [NVD entry CVE-2026-46725](https://nvd.nist.gov/vuln/detail/CVE-2026-46725)
- [github.com](https://github.com/FriendsOfPHP/security-advisories/blob/master/mmc/ceselector/CVE-2026-46725.yaml)

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Source page: https://erroneo.us/security/cve/CVE-2026-46725/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt