CVE-2025-64521

Q: How do I fix CVE-2025-64521?

Upgrade authentik to 2025.10.2 or later.

Q: Is CVE-2025-64521 being actively exploited?

Not that we know of. CVE-2025-64521 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 13% of all scored CVEs.

Q: How severe is CVE-2025-64521?

CVE-2025-64521 has a CVSS v3 base score of 4.8, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-64521 affect?

Published advisories record a fix for authentik (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

4.8

CVSS v3

NVD

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.

CWE-289

How to fix

Remediation Available

authentikNVD

Affected:>= 2025.10.0, < 2025.10.2Fixed in:2025.10.2CVE-2025-64521derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-289 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-56511	Critical	9.8	44%	-	Fix
CVE-2021-34746	Critical	9.8	18%	-	Fix
CVE-2017-16590	High	8.8	3.3%	-	-
CVE-2026-48618	Medium	6.5	3.2%	-	Fix
CVE-2025-55130	Critical	9.1	1.6%	-	Fix
CVE-2026-44492	High	8.6	0.9%	-	Fix

Common questions

How do I fix CVE-2025-64521?

Upgrade authentik to 2025.10.2 or later.

Is CVE-2025-64521 being actively exploited?

Not that we know of. CVE-2025-64521 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 13% of all scored CVEs.

How severe is CVE-2025-64521?

CVE-2025-64521 has a CVSS v3 base score of 4.8, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-64521 affect?

Published advisories record a fix for authentik (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2025-64521

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-20.