What is CVE-2026-65011?

CVE-2026-65011 is a medium-severity vulnerability in Graylog2 Graylog2-server, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-07-22.

How severe is CVE-2026-65011?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Graylog2 Graylog2-server

CVE-2026-65011

Graylog2 Server before commit 46a2eeb contains a missing per-entity permission check in the POST /events/definitions/{definitionId}/duplicate endpoint that allows authenticated users to clone any event definition. Attackers with the low-pr…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Graylog2 Graylog2-server — versions 0, 46a2eeba4cdbc1408ff4cbf7b466853a8acfb38d

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com (issue-tracking, technical-description)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-65011?: CVE-2026-65011 is a medium-severity vulnerability in Graylog2 Graylog2-server, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-07-22.
How severe is CVE-2026-65011?: Medium severity. CVSS v3 base score is 4.3 out of 10.