Improper Access Control in MISP Vulnerability Affects User Data Security
CVE-2026-91846

7.1HIGH

Key Information:

Vendor

Misp

Status
Misp
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91846?

A vulnerability in MISP allows malicious users to create collection elements from UUIDs without adequate authorization checks. This issue arises because collection elements store UUIDs that, when resolved, may refer to private objects the user shouldn't access. As a result, users could inadvertently expose sensitive data from other organizations, particularly in event collections. The fix introduces comprehensive authorization checks for UUIDs during both the creation and addition of collection elements, ensuring that only users with the correct permissions can access the related objects.

Affected Version(s)

MISP 0 < 2.5.46

References

https://github.com/MISP/MISP/commit/334d53709
patch

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

iglocska
Claude Opus 5 (1M context)
.