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☕ Maven
Not in CISA KEV
HIGH severity

Graylog Allows Stored Cross-Site Scripting via Files Plugin and API BrowserGHSA-q9q2-3ppx-mwqf

HIGH

GHSA-q9q2-3ppx-mwqf is a high-severity (CVSS 7.3) vulnerability in org.graylog2:graylog2-server. A fix is available for org.graylog2:graylog2-server — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
☕org.graylog2:graylog2-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Two minor vulnerabilities were identified in the Graylog2 enterprise server, which can be combined to carry out a stored cross-site scripting attack. An attacker with the permission FILES_CREATE can exploit these vulnerabilities to upload arbitrary Javascript code to the Graylog2 server, which - upon requesting of the file by a user of the API browser - results in the execution of this Javascript code in the context of the Graylog frontend application. This enables the attacker to carry out authenticated API requests with the permissions of the logged-in user, thereby taking over the user session.

Patches

The generic API has been removed in 6.2.0 rendering the attack vector unreachable and additional escaping has been added.

Analysis provided by Fabian Yamaguchi - Whirly Labs (Pty) Ltd

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.graylog2:graylog2-serverall versions6.2.0org.graylog2:graylog2-server:6.2.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.graylog2:graylog2-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.graylog2:graylog2-server to 6.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q9q2-3ppx-mwqf is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact Two minor vulnerabilities were identified in the Graylog2 enterprise server, which can be combined to carry out a stored cross-site scripting attack. An attacker with the permission `FILES_CREATE` can exploit these vulnerabilities to upload arbitrary Javascript code to the Graylog2 server, which - upon requesting of the file by a user of the API browser - results in the execution of this Javascript code in the context of the Graylog frontend application. This enables the attacker to carry out authenticated API requests with the permissions of the logged-in user, thereby taking over
O3 Security · Impact-Aware SCA

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Graylog Allows Stored Cross-Site Scripting via Files Plugin…