MISP Proposal ACL Bypass: Incomplete Distribution Level Check in Shadow Attribute Access Control

published 2026-10-19 21 d ago modified 2026-10-19 20 d ago also EUVD-2026-104127

cvss: 7.1; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

MISP contains an access control flaw in the proposal (shadow attribute) visibility logic. The authorization check accepted any attribute or object carrying one of the user's sharing groups without verifying the distribution level, and denied the owning organisation access to proposals on its own organisation-only attributes.

- A user belonging to a sharing group could view proposals on attributes or objects with that sharing group, regardless of the attribute's distribution level (levels 1-3 should restrict visibility)

- The owning organisation could not view proposals on its own org-only attributes

Security impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.

Affected: <2.5.48

Patch / fix

fixed in 1 links 1

MISP MISP 2.5.48

github.com/MISP/MISP@9c5af32 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 20 d ago (2026-10-19)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	7.1	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
CNA	4.0	7.1	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

Affected products

MISP MISP

Classification

Weakness

CWE-862 Missing Authorization

References

github.com /MISP/MISP/commit/9c5af321f
patch

Sources

CVE List CVE-2026-112178
NVD CVE-2026-112178

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary