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CVE-2026-12392

RPC secret disclosure via vendor data endpoint in Canonical MAAS

MEDIUM
5.3
CVSS Score
Published: October 2, 2026 at 07:24 PM UTC
Updated: October 6, 2026 at 04:00 PM UTC
2 products affected across 1 vendorMaasMetal As a Service

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Maas· Canonical
95%
v < 3.8.03.4.0 ≤ v < 3.4.103.5.0 ≤ v < 3.5.143.6.0 ≤ v < 3.6.53.7.0 ≤ v < 3.7.3
Affected range stops below 3.4.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.5.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.6.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.0, so it looks safe — our inference, not a vendor statement
Metal As a Service· Canonical
60%
v < 3.8.03.4.0 ≤ v < 3.4.103.5.0 ≤ v < 3.5.143.6.0 ≤ v < 3.6.53.7.0 ≤ v < 3.7.33.4.03.5.03.6.03.7.0
Affected range stops below 3.4.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.5.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.6.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.0, so it looks safe — our inference, not a vendor statement

References (6)

Patch
Source: cverecord
https://github.com/canonical/maas/commit/8489979d64b0e7f124e7cef66d02b21263918f9b
Patch
Source: cverecord
https://github.com/canonical/maas/commit/a9486ad0cc90f4571142c1bea13f02d1361cb31e
Patch
Source: cverecord
https://github.com/canonical/maas/commit/ead659f70224538517c80478c3fd8c9e730aae79
Patch
Source: cverecord
https://github.com/canonical/maas/commit/3864ef9dca54e36e3d34d18233b87666b8ee1dc8
Patch
Source: cverecord
https://github.com/canonical/maas/commit/65e89c05970f4514f9e6de043c2779017b43ad9d
Vendor AdvisoryIssue Tracking
Source: cverecord
https://bugs.launchpad.net/maas/+bug/2153942

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMcanonical
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-200

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