CVE-2026-12392: Information Disclosure (CVSS 5.3)

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

References

Other References

https://bugs.launchpad.net/maas/+bug/2153942 https://github.com/canonical/maas/commit/3864ef9dca54e36e3d34d18233b87666b8ee1dc8 https://github.com/canonical/maas/commit/65e89c05970f4514f9e6de043c2779017b43ad9d https://github.com/canonical/maas/commit/8489979d64b0e7f124e7cef66d02b21263918f9b https://github.com/canonical/maas/commit/a9486ad0cc90f4571142c1bea13f02d1361cb31e https://github.com/canonical/maas/commit/ead659f70224538517c80478c3fd8c9e730aae79

Frequently Asked Questions

What is CVE-2026-12392? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-12392? +

CVE-2026-12392 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-12392? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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