Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The TYPO3 HTML Sanitizer package (typo3/html-sanitizer, Packagist) is vulnerable in versions before 2.3.2. When the ALLOW_INSECURE_RAW_TEXT setting is enabled, whitespace variants of closing tags are not recognized by the sanitizer but are accepted by browsers as valid end tags, so content that follows can escape sanitization and enable cross-site scripting. The source does not describe what level of access an attacker needs beyond supplying content to be sanitized. Upgrade to version 2.3.2 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 2.1 | Low | 4.0 | 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 | CNA (TYPO3) |
- CISA KEV Not listed.
- EPSS 0.0028, the 20th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:57 UTC First seen by agentprime
- 31 Oct 2026, 13:57 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-jvf5-rxvv-3mcg
- OSV: GHSA-jvf5-rxvv-3mcg
- github.com/TYPO3/html-sanitizer/security/advisories/GHSA-jvf5-rxvv-3mcg
- nvd.nist.gov/vuln/detail/CVE-2026-47344
- github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47344.yaml
- github.com/TYPO3/html-sanitizer
- typo3.org/security/advisory/typo3-core-sa-2026-006