EUVD-2026-78324
GHSA-f94m-4r58-rq9p
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (CIRCL) · only source for this CVE.
CVSS VectorVendor: CIRCL
Lifecycle Timeline
3DescriptionCVE.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
AnalysisAI
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. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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