Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Graylog server (org.graylog2:graylog2-server, Maven) versions before 6.0.14 and from 6.1.0 before 6.1.10 are affected. An attacker with an account that can create event definitions, plus an active input on the server able to receive form data, can submit an HTML form through an Event Definition remediation step field to obtain session cookies of a user who can view alerts. Upgrade to 6.0.14 or 6.1.10. No workaround is listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.0 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0029, the 22nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:11 UTC First seen by agentprime
- 31 Oct 2026, 15:11 UTC Confirmed by OSV