EUVD-2026-78324
GHSA-f94m-4r58-rq9p
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization checks on every request
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Sep 15, 2026
An authorization bypass in MISP through version 2.5.45 lets an authenticated user who can edit events assign an arbitrary sharing_group_id they are not authorized to use, because the authorization check only ran when the request explicitly supplied distribution = 4. If the caller omits the distribution field, MISP's field-recovery logic restores the event's stored distribution (4, for sharing-group events) and persists the unauthorized sharing group ID, silently re-scoping who can see that event and its threat-intelligence content. No public exploit code or active exploitation has been identified at time of analysis, but exploitation is a single crafted edit request, so the integrity impact (VI:H, CVSS 4.0 base 7.1) is significant for multi-tenant or community-sharing MISP instances.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Primary rating from Vendor (CIRCL) · only source for this CVE.
CVSS VectorVendor: CIRCL
DescriptionCVE.org
Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path.
The vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP’s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved.
The fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change.
Version affected: ≤2.5.45
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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