Graylog Allows Session Takeover via Insufficient HTML Sanitization
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.graylog2:graylog2-server | < 6.0.14, >= 6.1.0, < 6.1.10 | 6.0.14, 6.1.10 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-79- Platform
- Java / Kotlin (Maven)
- Package
org.graylog2:graylog2-server- Disclosed
- 07.05.2025
- Updated
- 11.10.2026 12:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-76vf-mpmx-777j - CC BY 4.0
Vulnerability history: org.graylog2:graylog2-server
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 16
- First → latest
- 05.2022 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 8
- Low 3
Disclosures per year
- 2022: 3
- 2023: 3
- 2024: 2
- 2025: 4
- 2026: 4
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