Canonical MAAS RPC Secret Leak via Metadata (3.8.0)
CVE-2026-12392 Published on October 2, 2026
RPC secret disclosure via vendor data endpoint in Canonical MAAS
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.
Vulnerability Analysis
CVE-2026-12392 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-12392 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-12392
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Affected Versions
Canonical MAAS:- Version 3.4.0 and below 3.4.10 is affected.
- Version 3.5.0 and below 3.5.14 is affected.
- Version 3.6.0 and below 3.6.5 is affected.
- Version 3.7.0 and below 3.7.3 is affected.
- Before 3.8.0 is affected.