TYPO3 HTML Sanitizer up to 2.3.1 cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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3.4$0-$5k0.64

Summaryinfo

A vulnerability has been found in TYPO3 HTML Sanitizer up to 2.3.1 and classified as problematic. This vulnerability affects unknown code. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-47345. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in TYPO3 HTML Sanitizer up to 2.3.1. It has been declared as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.

It is possible to read the advisory at typo3.org. This vulnerability is known as CVE-2026-47345 since 05/19/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 2.3.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1835). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • TYPO3 Core

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HTML Sanitizer 2.3.2

Timelineinfo

05/19/2026 CVE reserved
06/08/2026 +20 days Advisory disclosed
06/08/2026 +0 days VulDB entry created
06/09/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: typo3.org
Status: Confirmed

CVE: CVE-2026-47345 (🔒)
GCVE (CVE): GCVE-0-2026-47345
GCVE (VulDB): GCVE-100-369295
CERT Bund: WID-SEC-2026-1835 - TYPO3 Core: Mehrere Schwachstellen

Entryinfo

Created: 06/08/2026 22:07
Updated: 06/09/2026 15:11
Changes: 06/08/2026 22:07 (33), 06/08/2026 22:08 (34), 06/09/2026 15:11 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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