Process-wide prototype pollution via unfiltered patch paths
Published Aug 7, 2026 · Updated Aug 7, 2026
Prototype pollution in Thomas Poignant scim-patch before 0.9.1 allows remote authenticated users to alter process-wide object properties. The addOrReplaceObjectAttribute path passes attacker-controlled value keys through resolvePaths to assign, which walks proto or constructor.prototype and writes to Object.prototype. Reachability requires a service to pass authenticated SCIM PATCH JSON to scimPatch; the resulting properties persist across plain objects until the Node process restarts.
Summary
What happened
Prototype pollution in Thomas Poignant scim-patch before 0.9.1 allows remote authenticated users to alter process-wide object properties. The addOrReplaceObjectAttribute path passes attacker-controlled value keys through resolvePaths to assign, which walks proto or constructor.prototype and writes to Object.prototype. Reachability requires a service to pass authenticated SCIM PATCH JSON to scimPatch; the resulting properties persist across plain objects until the Node process restarts.
The record
- CVE
- CVE-2026-48170
- Published
- Aug 7, 2026
- Updated
- Aug 7, 2026
- Vendor
- Thomas Poignant
- Product
- scim-patch
- Classifications
- CWE-1321, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 7, 2026CVE publishedPublication date reported by the CVE source.
- Aug 7, 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?
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- Affected versionversion=< 0.9.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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-9m6g-wc8r-q59c prototype-pollution proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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