CVE-2026-90454 Missing authorization in Malcolm
Authenticated users can modify session record tags in read-only deployments due to incomplete route blocking in the packet-analysis interface.
- 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-2026-90454?
CVE-2026-90454 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
A deployment mode intended to expose only read access to a bundled packet-analysis component's interface denies a list of write-capable routes by pattern, but the pattern omits routes that modify tags attached to stored session records, and the proxy configuration otherwise permits the request method those routes use. This allows an authenticated user on a deployment intended to be read-only to add or remove tags on stored session records.
Weakness: CWE-862
Which versions are affected by CVE-2026-90454?
How do I fix CVE-2026-90454?
No fix has been published for CVE-2026-90454 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-2026-90454 being exploited?
There is no known exploitation of CVE-2026-90454 in the wild and no public exploit code.
Sources
Also known as GHSA-ghx9-35h4-8wf6.