4.8

CVE-2025-64521: authentik deactivated service accounts can authenticate to OAuth

Analyzed
AliasesPYSEC-2025-237BIT-authentik-2025-64521GHSA-xr73-jq5p-ch8r
Published 19-11-2025Last modified 19-11-2025

Vulnerability summary

CVE-2025-64521 is a medium (CVSS 4.8) Authentication Bypass by Alternate Name vulnerability in goauthentik authentik. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0037-1

Timeline

  1. 19-11-2025
    PublishedVulnerability first disclosed.
  2. 19-11-2025
    Last modifiedVulnerability information updated.

Description

authentik is an open-source Identity Provider. Prior to versions 2025.8.5 and 2025.10.2, when authenticating with client_id and client_secret to an OAuth provider, authentik creates a service account for the provider. In previous authentik versions, authentication for this account was possible even when the account was deactivated. Other permissions are correctly applied and federation with other providers still take assigned policies correctly into account. authentik versions 2025.8.5 and 2025.10.2 fix this issue. A workaround involves adding a policy to the application that explicitly checks if the service account is still valid, and deny access if not.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.22% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.

Go1 product
  • goauthentik.io< 0.0.0-20251119140106-9dbdfc3f1be0 | All versions (No fix recorded)
Goauthentik1 product
  • authentik< 2025.10.2 | < 2025.8.5 | ≥ 2025.8.0, < 2025.8.5 | ≥ 2025.10.0, < 2025.10.2
PyPI1 product
  • authentik-client≥ 2025.10.0, < 2025.10.2

3 vendors · 3 products

References

4 links