- Component Type: TYPO3 CMS
- Subcomponent: Backend User Interface (ext:backend)
- Release Date: May 12, 2020
- Vulnerability Type: Insecure Deserialization
- Affected Versions: 9.0.0-9.5.16, 10.0.0-10.4.1
- Severity: High
- Suggested CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
- References: CVE-2020-11067, CWE-502
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.
Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.
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