CVE-2026-90449 Missing Authentication for Critical Function in Malcolm
Attackers can bypass gateway authentication to access the credential store when a specific authentication mode is configured, potentially compromising the entire deployment.
- 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-2026-90449?
CVE-2026-90449 is a medium-severity missing authorization vulnerability in CISA Malcolm, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When a particular authentication mode is configured, the reverse proxy forwards requests for a bundled third-party administrative interface directly to that interface without applying the gateway's own authentication requirement first. All access control for this administrative interface, which manages the credential store used to gate every other service in the deployment, is delegated entirely to that third-party interface's own login mechanism. Any authentication weakness in that bundled interface would compromise the credential store protecting the rest of the deployment.
Weakness: CWE-306
Which versions are affected by CVE-2026-90449?
How do I fix CVE-2026-90449?
No fix has been published for CVE-2026-90449 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-2026-90449 being exploited?
There is no known exploitation of CVE-2026-90449 in the wild and no public exploit code.
Sources
Also known as GHSA-339x-r4hv-hwwx.