CVE-2026-1436 Improper Access Control (IDOR) vulnerability in Graylog Web Interface

High 7.1 Published 18 Feb 2026 Updated 18 Feb 2026

Authenticated users can access other users' profiles and sensitive information by modifying the user ID in the URL due to missing authorization checks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-1436?

CVE-2026-1436 is a high-severity missing authorization vulnerability in Graylog Web Interface, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in the URL. An authenticated user can access other user's profiles without proper authorization checks. Exploiting this vulnerability allows valid users of the system to be listed and sensitive third-party information to be accessed, such as names, email addresses, internal identifiers, and last activity. The endpoint 'http://<IP>:12900/users/<my_user>' does not implement object-level authorization validations.

Weakness: CWE-639

Which versions are affected by CVE-2026-1436?

It affects 1 product.

Products include Graylog Graylog.

How do I fix CVE-2026-1436?

No fix has been published for CVE-2026-1436 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-1436 being exploited?

There is no known exploitation of CVE-2026-1436 in the wild and no public exploit code.

Sources

Also known as GHSA-ff7j-jwgr-hgxp.