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CVE-2026-12392— RPC secret disclosure via vendor data endpoint in Canonical MAAS

Quick assessment

Affected
Canonical MAAS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Canonical MAAS 版本 3.4.10、3.5.14、3.6.5、3.7.3 及 3.8.0 之前的版本中存在信息泄露漏洞，未认证的攻击者可通过供应商数据元数据端点以明文方式获取 RPC 密钥。如果目标机器在部署时启用了“注册为机架”（register as rack）选项，则任何获得或推断出该系统 ID 的攻击者均可查询 preseed/元数据服务器，从而泄露该密钥。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProduct Version RangeStatus
Canonical MAAS 3.4.0< 3.4.10 affected
3.5.0< 3.5.14 affected
3.6.0< 3.6.5 affected
3.7.0< 3.7.3 affected
< 3.8.0 affected
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I. Basic Information for CVE-2026-12392

Vulnerability Information
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Vulnerability Title
RPC secret disclosure via vendor data endpoint in Canonical MAAS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical MAAS 3.4.0 ~ 3.4.10 -

II. Public POCs for CVE-2026-12392

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III. Intelligence Information for CVE-2026-12392

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Patches & Fixes for CVE-2026-12392 (4)

Vendor Advisories for CVE-2026-12392 (1)

IV. Related Vulnerabilities

Same product: MAAS
Same vendor: Canonical

V. Comments for CVE-2026-12392

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