Graylog Web Interface 2.2.3 cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in Graylog Web Interface 2.2.3. The affected element is an unknown function. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-1439. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Graylog Web Interface 2.2.3. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused by a lack of proper sanitization and escaping in HTML output. Several endpoints include segments of the URL directly in the response without applying output encoding, allowing an attacker to inject and execute arbitrary JavaScript code when a user visits a specially crafted URL. Exploitation of this vulnerability may allow script execution in the victim's browser and limited manipulation of the affected user's session context, through the  '/ alerts /' endpoint.

The weakness was shared by Julen Garrido Estévez. The advisory is shared for download at incibe.es. This vulnerability is handled as CVE-2026-1439 since 01/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0458). Once again VulDB remains the best source for vulnerability data.

Affected

• Open Source Graylog

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Vendor

• Graylog

Name

• Web Interface

Version

• 2.2.3

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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