CVE-2026-50561 Yuxi has a JWT Authentication Bypass Leading to Cross-Instance Administrator Token Reuse
Attackers can reuse admin tokens from other instances to bypass authentication and take over the Yuxi knowledge base backend.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50561?
CVE-2026-50561 is a critical authentication bypass vulnerability in xerrors Yuxi, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Yuxi is a large-model-based intelligent knowledge base and knowledge graph agent development platform. Prior to version 0.6.2, the project's authentication mechanism contains a flaw. In affected versions, the system does not sufficiently validate the identity token in the Authorization header — only performing a validity check. This allows an administrator token generated in another deployment instance or local testing environment to be used to access the backend management interfaces of a different affected instance. An attacker who obtains or constructs an acceptable administrator Authorization token may bypass normal login authentication and gain administrator privileges. This vulnerability could allow an attacker to access system configurations, invoke backend management APIs, create administrator accounts, and ultimately take over the system backend. This issue has been fixed in version 0.6.2. Before upgrading, users are advised to implement the following temporary measures: Set the environment variable `JWT_SECRET_KEY` to a non-default value, and configure a unique, sufficiently strong JWT/authentication key for each deployment instance; and/or avoid exposing backend management interfaces directly to the public network.
Weakness: CWE-287
Which versions are affected by CVE-2026-50561?
How do I fix CVE-2026-50561?
No fix has been published for CVE-2026-50561 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-50561 being exploited?
There is no known exploitation of CVE-2026-50561 in the wild and no public exploit code.
Sources
Also known as GHSA-6959-99pq-c56x.