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

> Remote unauthenticated attackers can achieve code execution via PHP object injection in the Content Element Selector extension when persistent mode is enabled.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 19 May 2026
- **Updated:** 19 May 2026
- **Also known as:** GHSA-8x3j-439w-537c

## What is CVE-2026-46725?

CVE-2026-46725 is a critical unsafe deserialization vulnerability in TYPO3 Extension "Content Element Selector", published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-46725?

8 open source packages ship an affected version, including mmc/ceselector.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mmc/ceselector` | Packagist | All versions | 3.0.3 |
| `mmc/ceselector` | Packagist | All versions | 3.0.3 |
| `mmc/ceselector` | Packagist | From 4.0.0 | 4.0.2 |
| `mmc/ceselector` | Packagist | From 4.0.0 | 4.0.2 |
| `mmc/ceselector` | Packagist | From 5.0.0 | 5.0.1 |
| `mmc/ceselector` | Packagist | From 5.0.0 | 5.0.1 |
| `mmc/ceselector` | Packagist | From 6.0.0 | 6.0.1 |
| `mmc/ceselector` | Packagist | From 6.0.0 | 6.0.1 |

## How do I fix CVE-2026-46725?

Upgrade mmc/ceselector to a fixed version for your release line: 3.0.3, 4.0.2, 5.0.1 or 6.0.1.

## Is CVE-2026-46725 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46725 exists.

Public exploit code:

- TYPO3 ceselector Extension - Insecure Deserialization (nuclei): http/cves/2026/CVE-2026-46725.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46725 and fix it if it is affected.

What it is: CVE-2026-46725 is a critical unsafe deserialization vulnerability in TYPO3 Extension "Content Element Selector", published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46725 exists.

Affected packages and fixed versions:
- mmc/ceselector (Packagist): affected all versions; fixed in 3.0.3
- mmc/ceselector (Packagist): affected all versions; fixed in 3.0.3
- mmc/ceselector (Packagist): affected from 4.0.0; fixed in 4.0.2
- mmc/ceselector (Packagist): affected from 4.0.0; fixed in 4.0.2
- mmc/ceselector (Packagist): affected from 5.0.0; fixed in 5.0.1
- mmc/ceselector (Packagist): affected from 5.0.0; fixed in 5.0.1
- mmc/ceselector (Packagist): affected from 6.0.0; fixed in 6.0.1
- mmc/ceselector (Packagist): affected from 6.0.0; fixed in 6.0.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-46725/ (Markdown: https://insights.sbomify.com/CVE-2026-46725/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46725
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46725
- OSV: https://osv.dev/vulnerability/CVE-2026-46725

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46725/
Summaries are generated and may contain mistakes; the official description above is the record.