#VU85890 Improper access control in authentik - CVE-2024-23647

Vulnerability identifier: #VU85890

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-23647

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
authentik
Other software / Other software solutions

Vendor: Authentik Security Inc

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the PKCE implementation. A remote attacker can bypass implemented security restrictions and perform a PKCE downgrade attack on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

authentik: 2023.8.0 - 2023.10.6

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External links
https://github.com/advisories/GHSA-mrx3-gxjx-hjqj

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.