CVE-2023-38500

By-passing Cross-Site Scripting Protection in HTML Sanitizer

Description

TYPO3 HTML Sanitizer is an HTML sanitizer, written in PHP, aiming to provide cross-site-scripting-safe markup based on explicitly allowed tags, attributes and values. Starting in version 1.0.0 and prior to versions 1.5.1 and 2.1.2, due to an encoding issue in the serialization layer, malicious markup nested in a `noscript` element was not encoded correctly. `noscript` is disabled in the default configuration, but might have been enabled in custom scenarios. This allows bypassing the cross-site scripting mechanism of TYPO3 HTML Sanitizer. Versions 1.5.1 and 2.1.2 fix the problem.

Category

4.7
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.45%
Vendor Advisory github.com Vendor Advisory typo3.org
Affected: TYPO3 html-sanitizer
Published at:
Updated at:

References

Link Tags
https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-59jf-3q9v-rh6g vendor advisory
https://github.com/TYPO3/html-sanitizer/commit/e3026f589fef0be8c3574ee3f0a0bfbe33d7ebdb patch
https://typo3.org/security/advisory/typo3-core-sa-2023-002 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-38500?
CVE-2023-38500 has been scored as a medium severity vulnerability.
How to fix CVE-2023-38500?
To fix CVE-2023-38500, 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-2023-38500 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-38500 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-2023-38500?
CVE-2023-38500 affects TYPO3 html-sanitizer.
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