MISP Information Disclosure via Related Events Listing Bypassing Per-Event Authorization
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-285.
Summary
MISP contains an authorization bypass in the related events listing functionality. When a user requests the list of events correlated to a given event, the system retrieved related event metadata directly from the correlation table without re-validating the caller's access rights against each related event. The correlation table stores a snapshot of the event's distribution level and sharing group at the time the correlation was created, and does not carry the published flag. As a result, events that the caller is not permitted to open—because they are unpublished, or because their distribution or sharing group has changed since the correlation was recorded—were still returned with their metadata (title, date, correlating value counts). Preconditions: - An authenticated user with access to at least one event in MISP. - The existence of correlation entries linking that event to other events the user should not be able to view. Impact: - Unauthorized disclosure of event metadata (titles, dates, correlation counts) for events the user has no right to access. - Potential reconnaissance of threat-intelligence event names and timelines across sharing groups. Affected: MISP versions prior to the fix commit (2ffa97f05).
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-2026-66152 MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute DataPriority LOW 31
- 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
Timeline
- 2026-10-02 Threatist record created from CVE-2026-104910
- 2026-10-03 Alias added: GHSA-qxmx-5j2w-4wjc
- 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-2026-104910 · CVE Program
- CVE-2026-104910 · NVD
- FIRST EPSS
- GHSA-qxmx-5j2w-4wjc · GitHub Advisory Database · CC BY 4.0
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