CVE-2026-12392
RPC secret disclosure via vendor data endpoint in Canonical MAAS
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.
INFO
Published Date :
Oct. 2, 2026, 8:17 p.m.
Last Modified :
Oct. 2, 2026, 8:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | cc1ad9ee-3454-478d-9317-d3e869d708bc | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Canonical MAAS to versions 3.4.10, 3.5.14, 3.6.5, 3.7.3, or 3.8.0.
- Disable 'register as rack' option if not needed.
- Restrict access to the metadata endpoint.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-12392.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-12392 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-12392
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-12392 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-12392 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Oct. 02, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/12xxx/CVE-2026-12392.json">CVE-2026-12392</a> Added Reference https://bugs.launchpad.net/maas/+bug/2153942 Added Reference https://github.com/canonical/maas/commit/3864ef9dca54e36e3d34d18233b87666b8ee1dc8 Added Reference https://github.com/canonical/maas/commit/65e89c05970f4514f9e6de043c2779017b43ad9d Added Reference https://github.com/canonical/maas/commit/8489979d64b0e7f124e7cef66d02b21263918f9b Added Reference https://github.com/canonical/maas/commit/a9486ad0cc90f4571142c1bea13f02d1361cb31e Added Reference https://github.com/canonical/maas/commit/ead659f70224538517c80478c3fd8c9e730aae79