PT-2026-42078 · WordPress · Blogchat Chat System

Ibnu + 1 · Published 2026-05-20 · Updated 2026-05-28 · CVE-2026-8420

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions BLOGCHAT Chat System versions prior to 1.3.6.4

Description The BLOGCHAT Chat System plugin for WordPress contains a Cross-Site Request Forgery (CSRF) flaw. This occurs due to missing or incorrect nonce validation—a security token used to ensure that a request was intentionally sent by the user—on a function. This allows unauthenticated attackers to update settings and inject malicious web scripts via a forged request, provided they can trick a site administrator into performing an action, such as clicking a link.

Recommendations Update to a version newer than 1.3.6.3.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-8420

Affected Products

Blogchat Chat System

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2026-8420 · Security Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L215 · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L293 · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L215 · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L222 · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L208 · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L293 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/a62186aa-19aa-445b-8fdc-b029bdafd58f?source=cve · Note
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L208 · Note
• https://t.me/CVEtracker/54326 · Telegram Post
• https://plugins.trac.wordpress.org/browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L222 · Note
• https://reddit.com/r/StopBadBots/comments/1tqd1k6/critical_38_plugins_no_fix_no_mercy_if_youve_got · Reddit Post