CVE-2015-4413

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2015-06-24 · updated 2026-06-17
Weakness: CWE-79

Description

Cross-site scripting (XSS) vulnerability in the new_fb_sign_button function in nextend-facebook-connect.php in Nextend Facebook Connect plugin before 1.5.6 for WordPress allows remote attackers to inject arbitrary web script or HTML via the redirect_to parameter.

Affected products

nextendweb Facebook Connect: before 1.5.6 — fixed in 1.5.6

How to fix

Upgrade to a fixed version: nextendweb Facebook Connect 1.5.6. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/132425/WordPress-Nextend-Facebook-Connect-1.5.4-Cross-Site-Scripting.html
http://seclists.org/fulldisclosure/2015/Jun/70
http://www.securityfocus.com/bid/75391
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=1178751%40nextend-facebook-connect&old=1060317%40nextend-facebook-connect&sfp_email=&sfph_mail=
https://wordpress.org/plugins/nextend-facebook-connect/changelog/
http://packetstormsecurity.com/files/132425/WordPress-Nextend-Facebook-Connect-1.5.4-Cross-Site-Scripting.html
http://seclists.org/fulldisclosure/2015/Jun/70
http://www.securityfocus.com/bid/75391
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=1178751%40nextend-facebook-connect&old=1060317%40nextend-facebook-connect&sfp_email=&sfph_mail=
https://wordpress.org/plugins/nextend-facebook-connect/changelog/

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