CVE-2023-38500

low-risk
Published 2023-07-25

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.

Do I need to act?

-
0.34% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.7/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Html Sanitizer

Affected Vendors

Typo3

References (6)

Patch https://github.com/TYPO3/html-sanitizer/commit/e3026f589fef0be8c3574ee3f0a0bfbe3...
Vendor Advisory https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-59jf-3q9v-rh6g
Vendor Advisory https://typo3.org/security/advisory/typo3-core-sa-2023-002
Patch https://github.com/TYPO3/html-sanitizer/commit/e3026f589fef0be8c3574ee3f0a0bfbe3...
Vendor Advisory https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-59jf-3q9v-rh6g
Vendor Advisory https://typo3.org/security/advisory/typo3-core-sa-2023-002
21
/ 100
low-risk
Severity 15/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal