Unauthorized record modification via client-supplied primary key
Published May 20, 2026 · Updated May 20, 2026
Authorization bypass in MISP 2.5.0 through 2.5.37 allows remote authenticated users to modify existing shadow attributes. The ShadowAttributesController add action passes a client-supplied id into the creation workflow, causing the framework to update the matching primary-key record instead of creating a proposal. An account permitted to submit proposals can overwrite a shadow attribute tied to an event outside its authorized context, compromising stored threat-intelligence integrity.
Summary
What happened
Authorization bypass in MISP 2.5.0 through 2.5.37 allows remote authenticated users to modify existing shadow attributes. The ShadowAttributesController add action passes a client-supplied id into the creation workflow, causing the framework to update the matching primary-key record instead of creating a proposal. An account permitted to submit proposals can overwrite a shadow attribute tied to an event outside its authorized context, compromising stored threat-intelligence integrity.
The record
- CVE
- CVE-2026-9136
- Published
- May 20, 2026
- Updated
- May 20, 2026
- Vendor
- MISP Project
- Product
- MISP
- Classifications
- CWE-639, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 20, 2026CVE publishedPublication date reported by the CVE source.
- May 20, 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=2.5.0 <=2.5.37
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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