CVE-2026-47344
TYPO3 HTML Sanitizer allows Cross-Site Scripting
Description
When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.
INFO
Published Date :
June 8, 2026, 8:17 p.m.
Last Modified :
July 23, 2026, 8:10 a.m.
Remotely Exploit :
Yes !
Source :
f4fb688c-4412-4426-b4b8-421ecf27b14a
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | LOW | f4fb688c-4412-4426-b4b8-421ecf27b14a | ||||
| CVSS 4.0 | LOW | f4fb688c-4412-4426-b4b8-421ecf27b14a |
Solution
- Update the typo3/html-sanitizer dependency.
- Disable ALLOW_INSECURE_RAW_TEXT configuration.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-47344.
| URL | Resource |
|---|---|
| https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c | |
| https://typo3.org/security/advisory/typo3-core-sa-2026-006 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-47344 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-47344
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-47344 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-47344 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: HTML Sanitizer de TYPO3, Description: Cuando ALLOW_INSECURE_RAW_TEXT está habilitado, las etiquetas de cierre con variantes de espacio en blanco (p. ej., </style\t>) no son reconocidas por el saneador pero son aceptadas por los navegadores como etiquetas de cierre válidas, permitiendo que el contenido subsiguiente escape del saneamiento. Esto permite eludir el mecanismo de prevención de cross-site scripting de typo3/html-sanitizer anterior a la versión 2.3.2. -
CVE Modified by f4fb688c-4412-4426-b4b8-421ecf27b14a
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/TYPO3/html-sanitizer', 'vendor': 'TYPO3', 'product': 'HTML Sanitizer', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.3.2', 'versionType': 'semver'}], 'packageName': 'typo3/html-sanitizer', 'collectionURL': 'https://packagist.org', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-47344', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-08T19:50:27.408977Z'} -
New CVE Received by f4fb688c-4412-4426-b4b8-421ecf27b14a
Jun. 08, 2026
Action Type Old Value New Value Added Description When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added CWE CWE-436 Added Reference https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c Added Reference https://typo3.org/security/advisory/typo3-core-sa-2026-006