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CVE-2023-38500

By-passing Cross-Site Scripting Protection in HTML Sanitizer

MEDIUM
6.1
CVSS Score
Published: July 25, 2023 at 08:59 PM UTC
Updated: June 17, 2026 at 06:10 AM UTC
1 product affected across 1 vendorHtml Sanitizer

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Html Sanitizer· TYPO3composer
95%
v < 1.5.1v < 2.1.21.0.0 ≤ v < 1.5.12.0.0 ≤ v < 2.1.2
Affected range stops below 1.5.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.2, so it looks safe — our inference, not a vendor statement

References (3)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/TYPO3/html-sanitizer/commit/e3026f589fef0be8c3574ee3f0a0bfbe33d7ebdb
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-59jf-3q9v-rh6g
x_refsource_MISCVendor Advisory
Source: [email protected]
https://typo3.org/security/advisory/typo3-core-sa-2023-002

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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