CVE-2026-12392 RPC secret disclosure via vendor data endpoint in Canonical MAAS
Unauthenticated attackers can retrieve RPC secrets via vendor data endpoints if machines are registered as racks, potentially bypassing security controls.
- 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-2026-12392?
CVE-2026-12392 is a medium-severity vulnerability in Canonical MAAS, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An information exposure vulnerability in Canonical MAAS prior to versions 3.4.10, 3.5.14, 3.6.5, 3.7.3, and 3.8.0 allows an unauthenticated attacker to retrieve the RPC secret in plaintext via the vendor data metadata endpoint. If a target machine was deployed with the 'register as rack' option enabled, an attacker who obtains or infers the machine's system ID can query the preseed/metadata server to leak the secret.
Weakness: CWE-200
Which versions are affected by CVE-2026-12392?
How do I fix CVE-2026-12392?
No fix has been published for CVE-2026-12392 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12392 being exploited?
There is no known exploitation of CVE-2026-12392 in the wild and no public exploit code.
Sources
Also known as GHSA-3r9p-96x8-39gw.