CVE-2025-52553: authentik has Insufficient Session verification for Remote Access Control endpoint access

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-27 · updated 2026-06-17
Weakness: CWE-287

Description

authentik is an open-source identity provider. After authorizing access to a RAC endpoint, authentik creates a token which is used for a single connection and is sent to the client in the URL. This token is intended to only be valid for the session of the user who authorized the connection, however this check is missing in versions prior to 2025.6.3 and 2025.4.3. When, for example, using RAC during a screenshare, a malicious user could access the same session by copying the URL from the shown browser. authentik 2025.4.3 and 2025.6.3 fix this issue. As a workaround, it is recommended to decrease the duration a token is valid for (in the RAC Provider settings, set Connection expiry to `minutes=5` for example). The maintainers of authentik also recommend enabling the option Delete authorization on disconnect.

Affected products

goauthentik authentik: before 2025.4.3; from 2025.6.0 before 2025.6.3 — fixed in 2025.4.3, 2025.6.3

How to fix

Upgrade to a fixed version: goauthentik authentik 2025.4.3, 2025.6.3. Check the vendor advisory for mitigations.

References

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