Improper Authentication Affecting incus package, versions *
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Test your applications- Snyk IDSNYK-ECHOLATEST-INCUS-18496046
- published1 Aug 2026
- disclosed27 Mar 2026
Introduced: 27 Mar 2026
CVE-2026-33898 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest incus.
NVD Description
Note: Versions mentioned in the description apply only to the upstream incus package and not the incus package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
Incus is a system container and virtual machine manager. Prior to version 6.23.0, the web server spawned by incus webui incorrectly validates the authentication token such that an invalid value will be accepted. incus webui runs a local web server on a random localhost port. For authentication, it provides the user with a URL containing an authentication token. When accessed with that token, Incus creates a cookie persisting that token without needing to include it in subsequent HTTP requests. While the Incus client correctly validates the value of the cookie, it does not correctly validate the token when passed int the URL.
This allows for an attacker able to locate and talk to the temporary web server on localhost to have as much access to Incus as the user who ran incus webui. This can lead to privilege escalation by another local user or an access to the user's Incus instances and possibly system resources by a remote attack able to trick the local user into interacting with the Incus UI web server. Version 6.23.0 patches the issue.