What’s Vulnerable › Vulnerabilities

CVE-2026-65011: Graylog2 Server Missing Permission Check on Event Definition Duplicate

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-22 · updated 2026-10-24
• Weakness: CWE-862

Description

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-privilege eventdefinitions:create capability can read private event definitions including detection queries, aggregation thresholds, grouping fields, schedules, and notification bindings by duplicating them.

Affected products

• graylog2-server: through 7.1.5; through 7.0.10

References

• https://github.com/Graylog2/graylog2-server/commit/46a2eeba4cdbc1408ff4cbf7b466853a8acfb38d
• https://github.com/Graylog2/graylog2-server/issues/26590
• https://github.com/Graylog2/graylog2-server/pull/26706
• https://github.com/Graylog2/graylog2-server/pull/26718
• https://github.com/Graylog2/graylog2-server/pull/26719
• https://www.vulncheck.com/advisories/graylog2-server-missing-permission-check-on-event-definition-duplicate

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