CVE-2026-77520 Missing authorization in MaxKB
Attackers can leak application IDs and invoke other users' AI workflows to read data and modify chat records 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-2026-77520?
CVE-2026-77520 is a medium-severity missing authorization vulnerability in 1Panel-dev MaxKB, published on 21 Sep 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. In 2.10.2-lts and earlier, a normal user in the same workspace can obtain another user's application_id from the homepage application question-ranking endpoint when the published victim application has ranking activity in the selected date range and the attacker knows or guesses its name, even though direct application detail and debug-open routes deny access. An attacker who can create and publish a workflow application can place the disclosed identifier in an attacker-owned workflow application-node, trigger that workflow, receive output generated by the victim application, and create durable application_chat and application_chat_record rows under the victim application because save and runtime paths do not verify permission to use the referenced application. No fixed version is available as of this review.
Weakness: CWE-862
Which versions are affected by CVE-2026-77520?
How do I fix CVE-2026-77520?
No fix has been published for CVE-2026-77520 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-2026-77520 being exploited?
There is no known exploitation of CVE-2026-77520 in the wild and no public exploit code.
Sources
Also known as GHSA-4w4r-h4x8-mg7h.