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-privilege eventdefinitions:create capability can read private...

CVE-2026-65011

Technical details are not publicly available in the provided documents. Monitor for updates.

Cross-site Scripting (XSS)

org.graylog2:graylog2-server is vulnerable to Cross-site Scripting XSS. The vulnerability is due to insecure input handling due to the ability to inject and submit malicious HTML forms via the Event Definition Remediation Step field, which can result in session cookie theft under specific...

Authentication Bypass

org.graylog2, graylog2-server is vulnerable to Authentication Bypass. The vulnerability is due to HTTP Inputs not correctly rejecting messages when a specified header is missing or has an incorrect value, allowing the message to be ingested despite returning a 401 HTTP response...

DNS Cache Poisoning

graylog2-server is vulnerable to DNS Cache Poisoning. The vulnerability exists because the library uses a single source port for DNS queries, leading to cache poisoning attacks...

Session Fixation

graylog2-server is vulnerable to Session Fixation. The vulnerability exists because a node may still have the session cached even when a user has explicitly logged out, which allows the session to still be used for API requests until it has reached its original expiry time...