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High, CVSS 8.8

Insecure Deserialization in Backend User Settings in TYPO3 CMS

CVE-2020-11067GHSA-2wj9-434x-9hvp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3/cms-core 10.4.2, 9.5.17; typo3/cms 10.4.2, 9.5.17), 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

  • Packagist typo3/cms-core

    Affected
    >= 9.0.0, < 9.5.17>= 10.0.0, < 10.4.2
    Fixed in
    9.5.17, 10.4.2

  • Packagist typo3/cms

    Affected
    >= 10.0.0, < 10.4.2>= 9.0.0, < 9.5.17
    Fixed in
    9.5.17, 10.4.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2020-11067: 1.99% estimated exploitation activity in the next 30 days; percentile 80.67 (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.

It has been discovered that backend user settings (in $BEUSER-uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of 3rd party components this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability. Update to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described. References https://typo3.org/security/advisory/typo3-core-sa-2020-005

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

    Published from ghsa record GHSA-2wj9-434x-9hvp

Agent brief

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# Patch Next advisory brief: CVE-2020-11067

Advisory: Insecure Deserialization in Backend User Settings in TYPO3 CMS
IDs: CVE-2020-11067, GHSA-2wj9-434x-9hvp
Record: https://patchnext.com/advisories/cve-2020-11067 (revision 1, source checked 26 Oct 2026, 14:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/cms-core 10.4.2, 9.5.17; typo3/cms 10.4.2, 9.5.17. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/cms-core: affected >= 9.0.0, < 9.5.17; >= 10.0.0, < 10.4.2; fixed in 9.5.17, 10.4.2
- Packagist typo3/cms: affected >= 10.0.0, < 10.4.2; >= 9.0.0, < 9.5.17; fixed in 9.5.17, 10.4.2

## Suggested inspection (read-only)
- Packagist typo3/cms-core: check the installed version with your package manager.
- Packagist typo3/cms: 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-core, typo3/cms.
- 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-2wj9-434x-9hvp (GitHub-reviewed advisory GHSA-2wj9-434x-9hvp lists affected ranges: Packagist typo3/cms-core >=9.0.0 =10.0.0 =10.0.0 =9.0.0 <9.5.17)

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