EUVD-2026-70976
GHSA-4pv3-xjc8-wfm8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/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
REST API abuse by authenticated low-privilege user; no scope change as impact is contained within MISP's own authorization boundary; no availability impact.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
4DescriptionCVE.org
An authorization flaw in MISP allowed an authenticated user to submit a sharing_group_id without verifying that the user was authorized to use the referenced Sharing Group.
In several attribute and Galaxy Cluster creation and editing workflows, validation of the submitted Sharing Group was performed only when the request explicitly set the distribution field to 4 ("Sharing Group"). An attacker could therefore craft a request containing a sharing_group_id while omitting the distribution parameter, or otherwise avoiding the distribution == 4 condition, causing the Sharing Group authorization check to be skipped.
This could allow a user with permission to create or modify the affected MISP objects to associate data with a Sharing Group that they are not authorized to use. Depending on the affected object's existing distribution settings and subsequent processing, this could bypass intended information-sharing boundaries and result in unauthorized placement or distribution of data to members of another Sharing Group.
The issue affected attribute attachment and editing operations as well as Galaxy Cluster creation and editing. The fix ensures that authorization is performed whenever a non-empty sharing_group_id is submitted, independently of the distribution parameter. It also centralizes the authorization decision in SharingGroup::canUse() and explicitly rejects empty Sharing Group identifiers rather than allowing them to be interpreted as an unrestricted query.
AnalysisAI
Sharing Group authorization bypass in MISP allows an authenticated user with attribute or Galaxy Cluster creation permissions to associate objects with Sharing Groups they are not permitted to use. The flaw resides in AttributesController and GalaxyClustersController, where authorization checks against the Sharing Group were only invoked when the request explicitly set distribution == 4 - an attacker can craft a request containing sharing_group_id while omitting or manipulating the distribution parameter, causing the membership verification to be skipped entirely. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated MISP account (PR:L) with permission to create or modify MISP attributes or Galaxy Clusters - standard user-level access in most MISP deployments. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.6 (AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N) accurately characterizes this as a significant but access-gated flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade to a MISP version that incorporates commit 9b1363955 or later; consult the MISP GitHub releases page (https://github.com/MISP/MISP) and official CIRCL advisories for the specific tagged release containing this fix, as the exact version is not confirmed from available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all MISP instances in production and audit current Sharing Group memberships and permissions to understand your exposure. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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