🛡️ CVE-2022-36020 — html-sanitizer

🟡 CVSS 6.1 — Medium ✅ No Known Exploit CWE-79 NVD
6.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TYPO3 HTML Sanitizer Bypasses Cross-Site Scripting Protection

> ### Meta

> * CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (5.7)

Problem

Due to a parsing issue in upstream package [masterminds/html5](https://packagist.org/packages/masterminds/html5), malicious markup used in a sequence with special HTML comments cannot be filtered and sanitized. This allows to by-pass the cross-site scripting mechanism of typo3/html-sanitizer.

Solution

Update to typo3/html-sanitizer versions 1.0.7 or 2.0.16 that fix the problem described.

Credits

Thanks to David Klein who reported this issue, and to TYPO3 security team member Oliver Hader who fixed the issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2022-36020 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2022-36020 is recorded against 4 packages.

  • html-sanitizer (from 2.0.0 up to 2.0.16)
  • typo3/cms (from 11.0.0 up to 11.5.16)
  • typo3/cms-core (from 11.0.0 up to 11.5.16)
  • typo3/html-sanitizer (from 2.0.0 up to 2.0.16)

Timeline and source

Published on 13 September 2022 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
packagist.org
packagist.org
github.com
github.com
packagist.org
packagist.org

Details

Severity MEDIUM
CVSS Score 6.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2022-09-13
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
html-sanitizer 2.0.0 2.0.16
typo3/cms 11.0.0 11.5.16
typo3/cms-core 11.0.0 11.5.16
typo3/html-sanitizer 2.0.0 2.0.16

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