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cms-backend

By exploiting the defVals parameter, attackers could bypass field‑level access checks during record creation in the TYPO3 backend. This gave them the ability to insert arbitrary data into prohibited exclude fields of a database table for which the user already has write permission for a reduced set of fields. This issue affects TYPO3 CMS versions 10.0.0-10.4.54, 11.0.0-11.5.48, 12.0.0-12.4.40, 13.0.0-13.4.22 and 14.0.0-14.0.1.

CVE-2025-59020 is an authorization bypass vulnerability classified under CWE-863, discovered in the TYPO3 CMS platform. The flaw arises from improper enforcement of field-level access controls when processing the defVals parameter during record creation in the TYPO3 backend interface. Specifically, users who have write permissions limited to certain fields in a database table can exploit this vulnerability to insert arbitrary data into exclude fields that should be inaccessible to them. This occurs because the system fails to correctly validate or restrict the defVals parameter, allowing attackers to circumvent intended access restrictions. The affected TYPO3 CMS versions span from 10.0.0 to 14.0.1, covering multiple major releases. The vulnerability requires an attacker to have network access and at least low-level write privileges but does not require user interaction or elevated privileges beyond those limited write rights. The impact primarily affects data integrity and confidentiality, as unauthorized data can be inserted or manipulated in sensitive fields. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the ease of exploitation (low complexity), the requirement of limited privileges, and the absence of user interaction. No public exploits or active exploitation campaigns have been reported to date. The lack of patch links suggests that fixes may be pending or available through TYPO3 updates. Organizations relying on TYPO3 CMS for content management should assess their exposure and apply vendor updates or mitigations promptly to prevent unauthorized data manipulation.

Detailed information about CVE-2025-59020: CWE-863 Incorrect Authorization in TYPO3 TYPO3 CMS affecting TYPO3 TYPO3 CMS. Get real-time updates, technical detail

CVE-2025-59020: CWE-863 Incorrect Authorization in TYPO3 TYPO3 CMS - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-59020: CWE-863 Incorrect Authorization in TYPO3 TYPO3 CMS

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