CVE-2025-46827: Graylog Allows Session Takeover via Insufficient HTML Sanitization
Description
Graylog is a free and open log management platform. Prior to versions 6.0.14, 6.1.10, and 6.2.0, 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). Versions 6.0.14, 6.1.10, and 6.2.0 fix the issue. No known workarounds are available, as long as the relatively rare prerequisites are met.
Classification
CVE ID: CVE-2025-46827
CVSS Base Severity: HIGH
CVSS Base Score: 8.0
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Problem Types
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Affected Products
Vendor: Graylog2
Product: graylog2-server
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 8.41% (scored less or equal to compared to others)
EPSS Date: 2025-06-05 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: total
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2025-46827https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-76vf-mpmx-777j