CVE-2022-23499

Cross-Site Scripting Protection bypass in HTML Sanitizer

Description

HTML sanitizer is written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. In versions prior to 1.5.0 or 2.1.1, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized due to a parsing issue in the upstream package masterminds/html5. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. The upstream package masterminds/html5 provides HTML raw text elements (`script`, `style`, `noframes`, `noembed` and `iframe`) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting. This issue has been fixed in versions 1.5.0 and 2.1.1.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Third-Party Advisory github.com
Affected: TYPO3 html-sanitizer
Published at:
Updated at:

References

Link Tags
https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-hvwx-qh2h-xcfj third party advisory

Frequently Asked Questions

What is the severity of CVE-2022-23499?
CVE-2022-23499 has been scored as a medium severity vulnerability.
How to fix CVE-2022-23499?
To fix CVE-2022-23499, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-23499 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-23499 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-23499?
CVE-2022-23499 affects TYPO3 html-sanitizer.
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