Cross-site scripting in NextScripts: Social Networks Auto-Poster plugin for WordPress

1) Cross-site scripting

EUVDB-ID: #VU57925

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38356

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the $_REQUEST[‘page’] parameter in the inc/nxs_class_snap.php file. A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

NextScripts: Social Networks Auto-Poster: 1.6.1 - 4.3.20

CPE2.3

• cpe:2.3:a:nextscripts:social-networks-auto-poster-facebook-twitter-g:1.6.1:*:*:*:*:*:*:
• cpe:2.3:a:nextscripts:social-networks-auto-poster-facebook-twitter-g:1.7.0:*:*:*:*:*:*:
• cpe:2.3:a:nextscripts:social-networks-auto-poster-facebook-twitter-g:1.9.13:*:*:*:*:*:*:

External links

http://www.wordfence.com/blog/2021/10/xss-vulnerability-in-nextscripts-social-networks-auto-poster-plugin-impacts-100000-sites/

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.