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Low, CVSS 3.7

Information Disclosure in typo3/cms-install tool

CVE-2023-47126GHSA-p2jh-95jg-2w55

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3/cms-install 12.4.8), 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
3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2023-47126: 0.66% estimated exploitation activity in the next 30 days; percentile 51.67 (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:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C (3.5) Problem The login screen of the standalone install tool discloses the full path of the transient data directory (e.g. /var/www/html/var/transient/). This applies to composer-based scenarios only - “classic” non-composer installations are not affected. Solution Update to TYPO3 version 12.4.8 that fixes the problem described above. Credits Thanks to Markus Klein who reported and fixed the issue. References TYPO3-CORE-SA-2023-005

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

    Published from ghsa record GHSA-p2jh-95jg-2w55

Agent brief

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# Patch Next advisory brief: CVE-2023-47126

Advisory: Information Disclosure in typo3/cms-install tool
IDs: CVE-2023-47126, GHSA-p2jh-95jg-2w55
Record: https://patchnext.com/advisories/cve-2023-47126 (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: Low (CVSS 3.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/cms-install 12.4.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/cms-install: affected >= 12.2.0, < 12.4.8; fixed in 12.4.8

## Suggested inspection (read-only)
- Packagist typo3/cms-install: 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/cms-install.
- 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-p2jh-95jg-2w55 (GitHub-reviewed advisory GHSA-p2jh-95jg-2w55 lists affected ranges: Packagist typo3/cms-install >=12.2.0 <12.4.8)

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