Input validation bypass via shallow object assignment
Published Feb 7, 2022 · Updated Apr 23, 2025
Input validation bypass in Frourio before 0.26.0 allows remote attackers to submit unvalidated request bodies and queries. Generated Fastify pre-validation handlers copy plain request data onto top-level validator instances with Object.assign, so nested objects lack the class metadata needed to enforce their constraints. Exposure requires a generated application that integrates class-validator through its validators directory, and accepted input then reaches controller logic without the intended checks.
Summary
What happened
Input validation bypass in Frourio before 0.26.0 allows remote attackers to submit unvalidated request bodies and queries. Generated Fastify pre-validation handlers copy plain request data onto top-level validator instances with Object.assign, so nested objects lack the class metadata needed to enforce their constraints. Exposure requires a generated application that integrates class-validator through its validators directory, and accepted input then reaches controller logic without the intended checks.
The record
- CVE
- CVE-2022-23623
- Published
- Feb 7, 2022
- Updated
- Apr 23, 2025
- Vendor
- Frourio
- Product
- Frourio
- Classifications
- CWE-20, CWE-1321, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 7, 2022CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 0.26.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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