What is CVE-2022-36020?

CVE-2022-36020 is a medium-severity vulnerability in TYPO3 Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-09-13.

How severe is CVE-2022-36020?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2022-36020 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in TYPO3 Html-Sanitizer

CVE-2022-36020

The typo3/html-sanitizer package is an HTML sanitizer, written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. Due to a parsing issue in the upstream package `masterminds/html5`, malicious markup used in a sequence with special HTML comments cannot be filtered and sanitized. This allows for a bypass of the cross-site scripting mechanism of `typo3/html-sanitizer`. This issue has been addressed in versions 1.0.7 and 2.0.16 of the `typo3/html-sanitizer` package. Users are advised to upgrade. There are no known workarounds for this issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

TYPO3 Html-Sanitizer — versions >= 1.0.0, < 1.0.7, >= 2.0.0, < 2.0.16
TYPO3 HTML Sanitizer

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

karimhabush/cyberowl

References

github.com/TYPO3/html-sanitizer/security/advisories/GHSA-47m6-46mj-p235 (Third Party Advisory)
github.com/TYPO3/html-sanitizer/commit/60bfdc7f9b394d0236e16ee4cea8372a7defa493 (Patch, Third Party Advisory)
packagist.org/packages/masterminds/html5 (Third Party Advisory)
packagist.org/packages/typo3/html-sanitizer (Product, Third Party Advisory)

Frequently asked questions

What is CVE-2022-36020?: CVE-2022-36020 is a medium-severity vulnerability in TYPO3 Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-09-13.
How severe is CVE-2022-36020?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2022-36020 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.