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Medium, CVSS 4.7

Bypassing Cross-Site Scripting Protection in TYPO3 HTML Sanitizer

CVE-2023-47125GHSA-mm79-jhqm-9j54

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3/html-sanitizer 2.1.4, 1.5.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2023-47125: 0.58% estimated exploitation activity in the next 30 days; percentile 47.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (4.4) Problem DOM processing instructions are not handled correctly. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. Solution Update to typo3/html-sanitizer versions 1.5.3 or 2.1.4 that fix the problem described. Credits Thanks to Yaniv Nizry and Niels Dossche who reported this issue, and to TYPO3 core & security team member Oliver Hader who fixed the issue. References TYPO3-CORE-SA-2023-007 Context & Details at masterminds/html5

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-mm79-jhqm-9j54

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-47125

Advisory: Bypassing Cross-Site Scripting Protection in TYPO3 HTML Sanitizer
IDs: CVE-2023-47125, GHSA-mm79-jhqm-9j54
Record: https://patchnext.com/advisories/cve-2023-47125 (revision 1, source checked 26 Oct 2026, 14:11 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/html-sanitizer 2.1.4, 1.5.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/html-sanitizer: affected >= 1.0.0, <= 1.5.2; >= 2.0.0, <= 2.1.3; fixed in 1.5.3, 2.1.4

## Suggested inspection (read-only)
- Packagist typo3/html-sanitizer: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on typo3/html-sanitizer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-mm79-jhqm-9j54 (GitHub-reviewed advisory GHSA-mm79-jhqm-9j54 lists affected ranges: Packagist typo3/html-sanitizer >=1.0.0 =2.0.0 <=2.1.3)

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