#VU82206 Authorization bypass through user-controlled key in ActivityPub - CVE-2023-3707

Vulnerability identifier: #VU82206

Vulnerability risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2023-3707

CWE-ID: CWE-639

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ActivityPub
Web applications / Modules and components for CMS

Vendor: Matthias Pfefferle

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the affected plugin does not ensure that post contents to be displayed are public and belong to the plugin. A remote user can retrieve the content of arbitrary post via an IDOR vector

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ActivityPub: 0.0.1 - 0.17.0

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External links
https://wpscan.com/vulnerability/541bbe4c-3295-4073-901d-763556269f48

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.