MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-284.
Summary
MISP contains an authorization flaw in its correlation handling during attribute searches. When a user performs an attribute search that triggers correlation lookups, the system authorized access to correlated attributes and events based on a stale distribution snapshot stored on the correlation row rather than the live event access control list. Because the correlation row's distribution columns are a point-in-time copy that lacks a published flag, the authorization check becomes incorrect when an event is subsequently restricted (for example, its sharing group is changed or it is unpublished). As a result, an authenticated user could retrieve attributes and event details belonging to events they no longer have permission to view. Preconditions: - An authenticated user with at least read access to some events in the instance. - The existence of correlations between events, at least one of which has been restricted after the correlation was created. Impact: - Confidentiality: exposure of attribute values and event metadata that the user is not authorized to access. Affected versions: MISP prior to v2.5.48.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA MISP (MISP) Fixed in 2.5.48
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
MISP 2.5.48
8 records Highest priority Priority LOW 8 LOW
Other records, highest priority first
- TI-2026-66150 MISP Decaying Model Import Mass Assignment Allows Cross-Organization Model Overwrite and Default FlaggingPriority LOW 31
- TI-2026-66148 MISP TAXII Object Viewer Stored XSS via Unescaped JSON OutputPriority LOW 28
- TI-2026-66151 MISP Information Disclosure via Related Events Listing Bypassing Per-Event AuthorizationPriority LOW 24
Timeline
- 2026-10-02 Threatist record created from CVE-2026-104912
- 2026-10-03 Alias added: GHSA-w4mw-2637-h8xp
- 2026-10-03 CISA SSVC decision points changed
References
Patch 1
More MISP vulnerabilities
- TI-2025-41517 In MISP before 2.5.28, app/View/Elements/Workflows/executionPath.ctp allows XSS in the workflow execution path. CVSS 3.1CRITICAL 9.0
- TI-2026-65744 MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period CVSS 4.0CRITICAL 9.3
- TI-2026-54145 Path Traversal in MISP Object Template Resolution During STIX Import and Export in misp-stix library CVSS 4.0HIGH 8.8
- TI-2020-10250 MISP MISP-maltego 1.4.4 incorrectly shares a MISP connection across users in a remote-transform use case. CVSS 3.1CRITICAL 9.8
- TI-2026-59159 MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Flooding CVSS 4.0HIGH 8.7
- TI-2026-58541 MISP LDAP and LinOTP Authentication Bypass via Empty or Invalid Credentials CVSS 4.0CRITICAL 9.5
Sources
- CVE-2026-104912 · CVE Program
- CVE-2026-104912 · NVD
- FIRST EPSS
- GHSA-w4mw-2637-h8xp · GitHub Advisory Database · CC BY 4.0
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