CVE-2026-1440 Reflected Cross-Site Scripting (XSS) vulnerability in Graylog Web Interface

Medium 5.3 Published 18 Feb 2026 Updated 18 Feb 2026

Attackers can execute arbitrary JavaScript in victims' browsers via crafted URLs in the Graylog Web Interface, potentially leading to session manipulation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-1440?

CVE-2026-1440 is a medium-severity cross-site scripting vulnerability in Graylog Web Interface, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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 '/system/pipelines/' endpoint.

Weakness: CWE-79

Which versions are affected by CVE-2026-1440?

It affects 1 product.

Products include Graylog Graylog.

How do I fix CVE-2026-1440?

No fix has been published for CVE-2026-1440 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-1440 being exploited?

There is no known exploitation of CVE-2026-1440 in the wild and no public exploit code.

Sources

Also known as GHSA-47m2-7g75-xvrp.