01 Record

CVE-2026-103659

MISP: Object Distribution ACL Bypass via Event Flattening Exposes Organisation-Only Attributes

HighPUBLISHEDCNA: CIRCL

CNA base score7.1 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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02 Description

MISP: Object Distribution ACL Bypass via Event Flattening Exposes Organisation-Only Attributes

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 13.4% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-01.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-10-01 08:33Z28 DAYS AGO

Last updated

2026-10-01 15:24Z27 DAYS AGO

Reserved

2026-10-01

Assigning CNA

CIRCL

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Weaknesses

CWE-285Improper AuthorizationClass
CWE-862Missing AuthorizationClass

Data version

5.2

Document digest

4fb5a3b83947df9201f05d8dd5a63b946e72a25f0cda34e636ef6ca7a289429f

05 Affected products

VendorProductVersionsPlatforms

MISPMISP0 to < 2.5.48—

06 References

github.comSecurity patchhttps://github.com/MISP/MISP/commit/ab08edf92patch
github.comSecurity patchhttps://github.com/MISP/MISP/commit/07f3486d5patch

07 Remediation

The fix re-applies the object distribution and sharing-group ACL as a subquery condition on the Attribute.object_id field whenever the flatten option is active. This ensures that attributes belonging to objects the caller is not authorized to see are excluded from the flattened result set. The second commit refines the gate to use only the distribution ACL condition (correlated on Object.id) rather than the entire Object contain, preventing soft-delete state from incorrectly filtering attributes for the event owner.