8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2019-12747

CVE-2019-12747: Typo3 Vulnerable to Insecure Deserialization

TYPO3 8.x through 8.7.26 and 9.x through 9.5.7 allows Deserialization of Untrusted Data.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2019-12747

CVE-2019-12747:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
typo3/cms-core	composer	>= 8.0.0, < 8.7.27	8.7.27
typo3/cms-core	composer	>= 9.0.0, < 9.5.8	9.5.8
typo3/cms	composer	>= 8.0.0, < 8.7.27	8.7.27
typo3/cms	composer	>= 9.0.0, < 9.5.8	9.5.8

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The TYPO3 security advisory explicitly names FormEngine and DataHandler as vulnerable components. Both components handle serialized data structures (FlexForms) in backend operations. The vulnerability stems from processing user-controlled serialized data without proper validation. DataHandler's process_datamap handles form submissions containing serialized FlexForm values, while FormEngine's methods retrieve and process these values during form rendering. The patch in versions 8.7.27/9.5.8 likely added validation checks or replaced unsafe deserialization methods. The high confidence comes from the direct correlation between the advisory's component references and these core data processing functions.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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