CVE-2026-1439
Reflected XSS in Graylog 2.2.3 Alerts Endpoint Enables Script Execution
Publication date: 2026-02-18
Last updated on: 2026-02-18
Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| graylog | graylog | 2.2.3 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a Reflected Cross-Site Scripting (XSS) issue found in the Graylog Web Interface console, version 2.2.3. It occurs because the application does not properly sanitize or escape HTML output. Specifically, some endpoints include parts of the URL directly in the response without encoding them, which allows an attacker to inject and execute arbitrary JavaScript code when a user visits a specially crafted URL.
The vulnerability is exploited through the '/alerts/' endpoint, enabling script execution in the victim's browser and limited manipulation of the affected user's session context.
How can this vulnerability impact me? :
Exploitation of this vulnerability can lead to arbitrary JavaScript code execution in the victim's browser. This can result in unauthorized actions performed on behalf of the user, theft of session information, or manipulation of the user's session context.
Such impacts may include hijacking user sessions, defacement of the web interface, or redirecting users to malicious sites, potentially compromising the security and integrity of the affected system and user data.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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