What is CVE-2025-5689?

CVE-2025-5689 is a high-severity vulnerability in Canonical Authd, classified under Improper Privilege Management. CVSS score: 8.5/10. Published 2025-06-16.

How severe is CVE-2025-5689?

High severity. CVSS v3 base score is 8.5 out of 10.

Is CVE-2025-5689 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Privilege escalation in Canonical Authd

CVE-2025-5689

A flaw was found in the temporary user record that authd uses in the pre-auth NSS. As a result, a user login for the first time will be considered to be part of the root group in the context of that SSH session.

Vulnerability class: Privilege Escalation

EPSS: 0.003 (17.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Canonical Authd — versions 0.0.0

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

Public proof-of-concept exploits

References

security@ubuntu.com (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-5689?: CVE-2025-5689 is a high-severity vulnerability in Canonical Authd, classified under Improper Privilege Management. CVSS score: 8.5/10. Published 2025-06-16.
How severe is CVE-2025-5689?: High severity. CVSS v3 base score is 8.5 out of 10.
Is CVE-2025-5689 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.