CVE-2026-42337 MaxKB: Broken Access Control in MaxKB OSS URL Fetch API
Attackers can access or modify other applications' data via the OSS URL fetch API due to missing ownership validation.
- 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-2026-42337?
CVE-2026-42337 is a medium-severity missing authorization vulnerability in 1Panel-dev MaxKB, published on 26 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a broken access control vulnerability in the OSS file service URL fetch API (chat/api/oss/get_url). The endpoint uses application_id from the URL path without validating ownership, allowing attackers to perform operations under other applications’ policies. This vulnerability is fixed in 2.8.1.
Weakness: CWE-862
Which versions are affected by CVE-2026-42337?
How do I fix CVE-2026-42337?
No fix has been published for CVE-2026-42337 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-2026-42337 being exploited?
There is no known exploitation of CVE-2026-42337 in the wild and no public exploit code.
Sources
Also known as GHSA-2jmj-gwvg-3gp2.