Vulnerability advisory

GHSA-2wj9-434x-9hvp

Insecure Deserialization in Backend User Settings in TYPO3 CMS

Published May 13, 2020Updated Sep 10, 2026OSV record ↗

Also known as BIT-typo3-2020-11067CVE-2020-11067

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

typo3/cms-core Packagist

All typo3/cms-core advisories →

Affected	Fixed in
`9.0.0` to before 9.5.17	`9.5.17`Advisories →
Also listed as affected (26) `v9.0.0` `v9.1.0` `v9.2.0` `v9.2.1` `v9.3.0` `v9.3.1` `v9.3.2` `v9.3.3` `v9.4.0` `v9.5.0` `v9.5.1` `v9.5.10` `v9.5.11` `v9.5.12` `v9.5.13` `v9.5.14` `v9.5.15` `v9.5.16` `v9.5.2` `v9.5.3` `v9.5.4` `v9.5.5` `v9.5.6` `v9.5.7` `v9.5.8` `v9.5.9`
`10.0.0` to before 10.4.2	`10.4.2`Advisories →
Also listed as affected (8) `v10.0.0` `v10.1.0` `v10.2.0` `v10.2.1` `v10.2.2` `v10.3.0` `v10.4.0` `v10.4.1`

typo3/cms Packagist

All typo3/cms advisories →

Affected	Fixed in
`10.0.0` to before 10.4.2	`10.4.2`Advisories →
Also listed as affected (8) `v10.0.0` `v10.1.0` `v10.2.0` `v10.2.1` `v10.2.2` `v10.3.0` `v10.4.0` `v10.4.1`
`9.0.0` to before 9.5.17	`9.5.17`Advisories →
Also listed as affected (26) `v9.0.0` `v9.1.0` `v9.2.0` `v9.2.1` `v9.3.0` `v9.3.1` `v9.3.2` `v9.3.3` `v9.4.0` `v9.5.0` `v9.5.1` `v9.5.10` `v9.5.11` `v9.5.12` `v9.5.13` `v9.5.14` `v9.5.15` `v9.5.16` `v9.5.2` `v9.5.3` `v9.5.4` `v9.5.5` `v9.5.6` `v9.5.7` `v9.5.8` `v9.5.9`

Description

It has been discovered that backend user settings (in $BE_USER->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