CVE-2026-90450 Incorrect Authorization in Malcolm
Authenticated users can access unauthorized request handlers due to a fail-open authorization default, potentially leading to privilege escalation and data exposure.
- 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-2026-90450?
CVE-2026-90450 is a medium-severity missing authorization vulnerability in CISA Malcolm, published on 11 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The application's role-authorization lookup defaults to granting access when a request handler's name is not present in its table of role requirements, rather than defaulting to deny. Any request handler that is not explicitly registered in this table is reachable by any authenticated user regardless of their assigned role, and any newly added handler is fail-open by default until explicitly added to the table.
Weakness: CWE-863
Which versions are affected by CVE-2026-90450?
How do I fix CVE-2026-90450?
No fix has been published for CVE-2026-90450 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-2026-90450 being exploited?
There is no known exploitation of CVE-2026-90450 in the wild and no public exploit code.
Sources
Also known as GHSA-47x5-rf97-8ggr.