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Vulnerabilities

Vulnerability · CVE-2025-5689

A flaw was found in the temporary user record that authd uses in the pre-auth NSS.

Published Jun 16, 2025 · catalog updated Jun 17, 2025 · Canonical Authd

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-5689. EPSS is 0.30%. Act only if a listed version of Canonical Authd is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Advisory link
Affected products
vendor Canonical Authd 0.0.0 ≤0.5.4

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Canonical Authd 0.0.0 ≤0.5.40.0.0 ≤0.5.4

How to fix CVE-2025-5689

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-5689. EPSS is 0.30%. Act only if a listed version of Canonical Authd is installed.

Which versions are affected?

Compare what you have installed with Canonical Authd 0.0.0 ≤0.5.4 0.0.0 ≤0.5.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 16, 2025 · EUVD

    Detected

    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.

  2. Jun 17, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-5689

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-5689

    30-day exploitation probability 0.30%

    first.org
  • EUVDVulnerability recordEUVD-2025-18385

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026