PT-2026-48999 · Misp · Misp

Andras Iklody + 1 · Published 2026-06-12 · Updated 2026-06-12 · CVE-2026-54397

Mitre

CVSS v4.0

6.1

Medium

Base vector

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

A vulnerability in MISP’s non-REST event editing path allowed an authenticated user with event edit permissions to manipulate the submitted form data and set an event’s sharing group id to a sharing group they were not authorized to use. When distribution was set to sharing group distribution, the non-REST save path accepted the submitted sharing group id without performing the same sharing group authorization check enforced by the REST edit path.

An attacker could exploit this by tampering with the event edit request and assigning an event to an undisclosed or unauthorized sharing group. This could result in unauthorized use of restricted sharing groups, disclosure of the sharing group name in event listings, and unintended modification of the event’s distribution metadata.

The issue is fixed by validating that the selected sharing group can be used by the current user when the sharing group is changed, and by clearing sharing group id when the event distribution is not set to sharing group distribution.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-54397

Affected Products

Misp

References · 2

• https://github.com/MISP/MISP/commit/609ff6c785d7dae41d22ef43dda9347d34cd2a58 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-54397 · Security Note