EUVD-2026-75409
GHSA-46cw-r5cx-57f2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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
PR:L for authenticated low-priv user; S:C because local_only tag propagation impacts integrity of downstream synchronized MISP instances beyond the vulnerable system.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
4DescriptionCVE.org
Affected versions of MISP do not consistently enforce the acting user's authorization when instantiating event templates.
For templates using distribution = 4, the template can specify a sharing_group_id. The instantiation path passed that value into event creation without verifying that the user instantiating the template was actually permitted to use the selected sharing group. The commit notes that Event::_add() only performed its own sharing-group authorization in another code path, leaving template instantiation able to write the identifier directly.
The same instantiation path also attached template-specified tags without checking the user's normal tagging permissions. In addition, it hardcoded local => 0, meaning tags marked local_only could be attached globally and consequently propagate through synchronization or export, contrary to their intended restriction.
The fix adds explicit SharingGroup::canUse() authorization for the acting user, applies the same tag-modification checks used by normal event tagging, and ensures local_only tags are attached locally.
Version affected: ≤2.5.45
AnalysisAI
Missing authorization in MISP's event template instantiation path allows authenticated users to write events into sharing groups they are not permitted to access, and to attach tags beyond their normal tagging permissions. Affected are all MISP deployments running version 2.5.45 and earlier. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid MISP account with at least the minimum privilege level to instantiate event templates; (2) existence of at least one event template with `event_defaults.distribution = 4` (sharing group) that is readable by the acting user - i.e., the template itself has distribution=1 (community) or otherwise grants the user view access; (3) a configured sharing group on the instance whose ID is referenced in that template. … 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/VC:N/VI:H) scores 7.1, reflecting a low-complexity network attack requiring only a valid MISP account. … 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 | Upstream fix is available via commit 3aa3a9a97 (https://github.com/MISP/MISP/commit/3aa3a9a97). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, review MISP access logs to identify any template instantiation activity by low-privilege accounts and audit current users with elevated permissions to sharing groups. …
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External POC / Exploit Code
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