What is CVE-2026-56423?

CVE-2026-56423 is a high-severity vulnerability in Misp, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-22.

How severe is CVE-2026-56423?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2026-56423 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Misp

CVE-2026-56423

MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports and Sharing Groups. The affected deleteSelection handlers authorized deletion using broad role-level permissions instead of validating authorizat…

Vulnerability class: Broken Access Control

EPSS: 0.003 (25.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Misp — versions 0
Misp-project Misp

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

BiiTts/CVE-2026-56423-MISP-deleteSelection-BrokenAccessControl

References

5a6e4751-2f3f-4070-9419-94fb35b644e8 (Patch, patch)
5a6e4751-2f3f-4070-9419-94fb35b644e8 (Patch, patch)

Frequently asked questions

What is CVE-2026-56423?: CVE-2026-56423 is a high-severity vulnerability in Misp, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-22.
How severe is CVE-2026-56423?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2026-56423 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.