TYPO3 HTML Sanitizer allows Cross-Site Scripting
Summary
| CVE | CVE-2026-47344 |
|---|---|
| State | PUBLISHED |
| Assigner | TYPO3 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-08 20:17:01 UTC |
| Updated | 2026-06-09 13:46:50 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 2.1 LOW from f4fb688c-4412-4426-b4b8-421ecf27b14a
CVSS:4.0/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
EPSS: 0.002820000 probability, percentile 0.196910000 (date 2026-06-15)
Problem Types: CWE-79 | CWE-436 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-436 CWE-436 Interpretation Conflict
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | f4fb688c-4412-4426-b4b8-421ecf27b14a | Secondary | 2.1 | LOW | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 2.1 | LOW | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
PresentPrivileges Required
LowUser Interaction
PassiveConfidentiality
NoneIntegrity
NoneAvailability
NoneSub Conf.
LowSub Integrity
LowSub Availability
NoneCVSS:4.0/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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | TYPO3 | HTML Sanitizer | affected 2.3.2 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| typo3.org/security/advisory/typo3-core-sa-2026-006 | f4fb688c-4412-4426-b4b8-421ecf27b14a | typo3.org | |
| github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0... | f4fb688c-4412-4426-b4b8-421ecf27b14a | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: IPC Labs (en)
CNA: Oliver Hader (en)
There are currently no legacy QID mappings associated with this CVE.