SB2025050790 - Multiple vulnerabilities in Graylog

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2025-46827)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The vulnerability allows a remote user to obtain user session cookies.

The vulnerability exists due to insufficient HTML sanitization in the Event Definition Remediation Step field when rendering attacker-supplied HTML content. A remote user can submit a crafted HTML form to obtain user session cookies.

Exploitation requires a user account with permissions to create event definitions, a victim with permissions to view alerts, and an active input on the server capable of receiving form data.

2) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The vulnerability allows a remote user to execute arbitrary JavaScript in the victim's browser and perform authenticated API requests in the context of the victim's session.

The vulnerability exists due to cross-site scripting in the files plugin and API browser when handling uploaded files requested through the API browser. A remote user can upload a file containing crafted JavaScript code to execute arbitrary JavaScript in the victim's browser and perform authenticated API requests in the context of the victim's session.

User interaction is required when a user requests the uploaded file through the API browser.

Remediation

Install update from vendor's website.

References

• https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-76vf-mpmx-777j
• https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-q9q2-3ppx-mwqf