MISP Event Report Cross-Event Reparenting via Unscoped UUID Resolution in editReport

published 2026-09-21 49 d ago modified 2026-09-21 49 d ago also EUVD-2026-83911

cvss: 6.4; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits: 0; none known

When a user creates or edits a report inside an event, MISP can identify an existing report using its UUID without properly checking whether that report actually belongs to the same event.

As a result, a user who has editing rights on one event could potentially move a report from another event into their own event, as long as they know or can guess the report’s UUID. Once moved, they could view and change information that they were not originally allowed to access.

The vulnerability requires the attacker to have editor access to at least one event and to know or discover a valid report UUID.

The main impact is that private event reports could be exposed or modified across event boundaries, bypassing MISP’s normal access restrictions.

Version affected: <2.5.47

Patch / fix

fixed in 1 links 1

MISP MISP 2.5.47

github.com/MISP/MISP@43665b9 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 49 d ago (2026-09-21)

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.4	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CNA	4.0	6.4	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/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

Affected products

MISP MISP

Classification

Weakness

CWE-639 Authorization Bypass Through User-Controlled Key
CWE-284 Improper Access Control

References

github.com /MISP/MISP/commit/43665b9bb
patch

Sources

CVE List CVE-2026-94393
NVD CVE-2026-94393

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