Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck

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

Medium 4.3

In plain English

A medium-severity missing authorization in graylog2-server from Graylog2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.4%top 68.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Graylog2	graylog2-server	0 – through 7.1.50 – through 7.0.10

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Researcher Disclosure issue-tracking, technical-description
Pull Request issue-tracking, patch
Patch Commit patch
7.0 Backport Fix issue-tracking, patch
7.1 Backport Fix issue-tracking, patch
https://www.vulncheck.com/advisories/graylog2-server-missing-permission-check-on-event-definition-duplicate third-party-advisory