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CVE-2025-5689

Improper Permission Management in SSH Session Handling

HIGH
8.5
CVSS Score
Published: June 16, 2025 at 11:37 AM UTC
Updated: June 17, 2026 at 09:48 AM UTC
1 product affected across 1 vendorAuthd

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Severity
HIGH8.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Authd· Canonical
95%
v < 0.5.40.0.0 ≤ v ≤ 0.5.40.0.0
Affected range stops below 0.5.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

PatchVendor Advisory
Source: [email protected]
https://github.com/ubuntu/authd/security/advisories/GHSA-g8qw-mgjx-rwjr

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.5HIGHcanonical
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-269

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