CVE-2026-107333 Incorrect Authorization in Malcolm
Authenticated users can bypass RBAC restrictions via path normalization flaws to access administrative endpoints in Malcolm.
- 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-2026-107333?
CVE-2026-107333 is a high-severity authentication bypass vulnerability in CISA Malcolm, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Malcolm's nginx based reverse proxy contains a URL path normalization inconsistency between its Lua based role-based access control (RBAC) authorization layer and nginx's own request routing logic. An authenticated user can craft a specially formatted request path to bypass role-based restrictions and reach administrative or role gated endpoints they should not have access to. This affects all restricted paths protected by the RBAC authorization layer, including file upload, PHP server, htadmin, and authentication management interfaces.
Weakness: CWE-863
Which versions are affected by CVE-2026-107333?
How do I fix CVE-2026-107333?
No fix has been published for CVE-2026-107333 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-107333 being exploited?
There is no known exploitation of CVE-2026-107333 in the wild and no public exploit code.
Sources
Also known as GHSA-v66f-cwcm-hf73, GHSA-x76r-x5vc-mv69.