EUVD-2026-70958
GHSA-9pvc-hwg3-vhmw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/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
Scope changes because deleted attributes propagate to downstream MISP sync consumers, extending integrity harm beyond the directly attacked instance.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
4DescriptionCVE.org
An incorrect authorization vulnerability in MISP allowed authenticated users to delete attributes from events despite lacking the required perm_modify or perm_modify_org permissions.
The affected attribute deletion paths relied on organization membership checks performed by MispAttribute::deleteAttribute() but did not consistently enforce MISP's event modification authorization rules. Consequently, a user belonging to the organization associated with an event could potentially delete individual attributes or perform bulk attribute deletion even when their assigned role was not authorized to modify the event.
This created an inconsistency between attribute editing and deletion: editing an attribute correctly used MISP's ACL::canModifyEvent() authorization logic, whereas the affected deletion operations could bypass these permission checks.
An authenticated attacker with access to an affected MISP instance and membership in the organization owning an event could exploit this flaw to remove attributes from that event, potentially causing unauthorized modification or loss of threat intelligence data.
The patch introduces a common authorization check for all affected deletion paths. Before deletion, MISP now resolves the associated events and verifies that the current user is authorized to modify each event using the same authorization mechanism used by normal event and attribute modification operations.
AnalysisAI
Incorrect authorization in MISP allows any authenticated user who is a member of an event-owning organization to delete individual attributes or perform bulk attribute deletion from that event, regardless of whether their assigned role carries perm_modify or perm_modify_org permissions. Three deletion controller actions in AttributesController.php - delete(), deleteSelection(), and deleteSelected() - relied only on organization membership checks inside MispAttribute::deleteAttribute() rather than on MISP's authoritative ACL::canModifyEvent() gate, which attribute editing operations correctly invoked. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid, active account on the target MISP instance (PR:L) and must be a member of the organization identified as the event creator (`orgc_id`). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) reflects low-complexity, network-accessible exploitation requiring only a low-privilege authenticated account with no user interaction, scoring 8.3. … 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 | Apply the vendor-released patch available at https://github.com/MISP/MISP/commit/d0a6f963f, which is confirmed to address all three affected deletion code paths by introducing `__assertCanModifyEvents()`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all MISP deployments and verify current versions to determine patch applicability. …
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Same weakness CWE-863 – Incorrect Authorization
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External POC / Exploit Code
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