CVE-2025-46827
Graylog Allows Session Takeover via Insufficient HTML Sanitization
Description
### Impact It is possible to obtain user session cookies by submitting an HTML form as part of an Event Definition Remediation Step field. For this attack to succeed, the attacker needs a user account with permissions to create event definitions, while the user must have permissions to view alerts. Additionally, an active Input must be present on the Graylog server that is capable of receiving form data (e.g. a HTTP input, TCP raw or syslog etc). ### Patches ### Workarounds None, as long as the relatively rare prerequisites are met. Analysis provided by Fabian Yamaguchi - Whirly Labs (Pty) Ltd
How to fix CVE-2025-46827
To remediate CVE-2025-46827, upgrade the affected package to a fixed version below.
- —upgrade to 6.0.14 or later
Is CVE-2025-46827 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 6.0.14
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |