What is CVE-2023-1786?

CVE-2023-1786 is a medium-severity vulnerability in Canonical Ltd. Cloud-Init, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.5/10. Published 2023-04-26.

How severe is CVE-2023-1786?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in Canonical Ltd. Cloud-Init

CVE-2023-1786

Sensitive data could be exposed in logs of cloud-init before version 23.1.2. An attacker could use this information to find hashed passwords and possibly escalate their privilege.

Published 2023-04-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Canonical Ltd. Cloud-Init — versions 0
Canonical Cloud-Init
Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
Fedoraproject Fedora — versions 38

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

github.com/canonical/cloud-init/commit/a378b7e4f47375458651c0972e7cd813f6fe0a6b (Patch, patch)
bugs.launchpad.net/cloud-init/+bug/2013967 (issue-tracking, Issue Tracking)
ubuntu.com/security/notices/USN-6042-1 (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2023-1786?: CVE-2023-1786 is a medium-severity vulnerability in Canonical Ltd. Cloud-Init, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.5/10. Published 2023-04-26.
How severe is CVE-2023-1786?: Medium severity. CVSS v3 base score is 5.5 out of 10.