CVE-2026-65011
Received Received - Intake

Missing Permission Check in Graylog2 Server Allows Event Definition Cloning

Publication date: 2026-07-22

Last updated on: 2026-07-22

Assigner: VulnCheck

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.

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Meta Information

Published
2026-07-22
Last Modified
2026-07-22
Generated
2026-07-22
AI Q&A
2026-07-22
EPSS Evaluated
N/A
NVD
CVE-2026-65011
EUVD
EUVD-2026-47743

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
graylog2 graylog2-server to 7.1.5 (inc)
graylog2 graylog2-server to 7.0.10 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

CVE-2026-65011 is a missing permission check in Graylog2 Server's event definition duplicate endpoint. It allows authenticated users with low privileges to clone and read private event definitions, including sensitive details like detection queries and notification settings.

Detection Guidance

Check Graylog2 server logs for repeated POST requests to /events/definitions/{definitionId}/duplicate endpoints. Monitor for unauthorized duplication attempts of event definitions by users with low-privilege capabilities like eventdefinitions:create.

Impact Analysis

Attackers could access private alert configurations, exposing detection logic, thresholds, and notification bindings. This undermines access controls and may lead to data leaks or misuse of sensitive information.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by exposing sensitive alert configurations, detection queries, and notification settings to unauthorized users. Unauthorized access to such data may violate confidentiality requirements under these regulations.

Mitigation Strategies
  • Upgrade Graylog2 server to version 7.1.6 or later, or apply the backported patch to versions 7.0 and 7.1.
  • Review and revoke unnecessary eventdefinitions:create capabilities from low-privilege users.
  • Audit existing event definitions for unauthorized duplication or access.

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