CVE-2026-12392: Canonical MAAS · RPC secret disclosure via vendor data endpoint
Affects Canonical MAASSource CVE Database V5
Not known to be exploited · CVSS 5.3 Medium · fixed in 3.8.0 : update Canonical MAAS when convenient.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers can reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-10-03.
- Patch
- Available – fixed in 3.8.0, 3.7.3, 3.6.5 +2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 2 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| CanonicalMAAS | Affected
| Fixed in
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| CanonicalMAAS | Affected
| Fixed in
|
| CanonicalMAAS | Affected
| Fixed in
|
| CanonicalMAAS | Affected
| Fixed in
|
| CanonicalMAAS | Affected
| Fixed in
|
GitHubmaaspkg:github/maasOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- github.com/canonical/maas/commit/8489979d64b0e7f124e7cef66d02b21263918f9b (opens in a new tab)
- github.com/canonical/maas/commit/a9486ad0cc90f4571142c1bea13f02d1361cb31e (opens in a new tab)
- github.com/canonical/maas/commit/ead659f70224538517c80478c3fd8c9e730aae79 (opens in a new tab)
- github.com/canonical/maas/commit/3864ef9dca54e36e3d34d18233b87666b8ee1dc8 (opens in a new tab)
- github.com/canonical/maas/commit/65e89c05970f4514f9e6de043c2779017b43ad9d (opens in a new tab)
- bugs.launchpad.net/maas/+bug/2153942 (opens in a new tab)