7.3

CVE-2026-6970: canonical authd Placement of User into Incorrect Group

CVSS: 7.3v4.0HighDeferred
AliasesUBUNTU-CVE-2026-6970GHSA-fg3j-5w9g-hmg7GO-2026-5361
Published 27-04-2026Last modified 27-04-2026
Open JSON

Vulnerability summary

CVE-2026-6970 is a high (CVSS 7.3) Placement of User into Incorrect Group vulnerability in canonical authd. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.5% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.15%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1USN-8212-1

Timeline

  1. 27-04-2026
    PublishedVulnerability first disclosed.
  2. 27-04-2026
    Last modifiedVulnerability information updated.

Description

authd prior to version 0.6.4 contains a logic error in primary group ID assignment that can lead to local privilege escalation. When a user's primary group ID (GID) differs from their UID, either because the account was created with authd prior to version 0.5.4 or because the primary group was manually changed via the `authctl group set-gid` command, and the user's identity provider record is updated, authd incorrectly resets the user's primary group ID to their UID upon next login. This causes newly created files and directories to be owned by the wrong group, causing denial of service issues, and potentially granting unintended access to other local users and allowing local privilege escalation.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.04 pp

From 0.11% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Canonical1 product
  • authd≥ 0.6.0, < 0.6.4 | ≥ 0.6.1, < 0.6.1ubuntu0.1
Github.com/canonical1 product
  • authd≥ 0.6.0, < 0.6.4
Ubuntu1 product
  • authd< 0.6.1ubuntu0.1

3 vendors · 3 products

References

7 links