Vulnerability identifier: #VU34057

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
The Official Facebook Chat Plugin
Web applications / Modules and components for CMS

Vendor: Facebook 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 "wp_ajax_update_options" AJAX action. A remote authenticated attacker can send a request to update the options and hook-up their own Facebook Messenger account.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

The Official Facebook Chat Plugin: 1.0 - 1.5

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External links
http://wpvulndb.com/vulnerabilities/10343/
http://www.youtube.com/watch?v=rlgcBqLsSi8&feature=emb_logo

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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.