Security bypass via unsafe inherited property copying
Published Jan 28, 2026 · Updated Jan 28, 2026
Prototype pollution in Microsoft Maker.js 0.19.1 and earlier allows remote attackers to alter application data through untrusted objects. The makerjs.extendObject function iterates inherited properties with for-in and assigns them to the target without own-property checks or filters for proto, constructor, and prototype. A downstream application must pass attacker-controlled objects into the function; the resulting property injection can bypass logic that trusts the merged object's fields.
Summary
What happened
Prototype pollution in Microsoft Maker.js 0.19.1 and earlier allows remote attackers to alter application data through untrusted objects. The makerjs.extendObject function iterates inherited properties with for-in and assigns them to the target without own-property checks or filters for proto, constructor, and prototype. A downstream application must pass attacker-controlled objects into the function; the resulting property injection can bypass logic that trusts the merged object's fields.
The record
- CVE
- CVE-2026-24888
- Published
- Jan 28, 2026
- Updated
- Jan 28, 2026
- Vendor
- Microsoft
- Product
- Maker.js
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 28, 2026CVE publishedPublication date reported by the CVE source.
- Jan 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 0.19.1
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
- GHSA-2cp6-34r9-54xx inherited-property PoCproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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