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High severity · published Sep 9, 2026
CVE-2026-83593
WPBot <= 8.7.3 - Unauthenticated Stored Cross-Site Scripting via 'conversation' Parameter
7.2
CVSS
0.5%
EPSS
No
On KEV
Description
The WPBot – AI ChatBot for Live Support, Lead Generation, AI Services plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'conversation' parameter in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The action is gated only by a nonce that is localized into every public-facing page via wp_localize_script, rendering the nonce check ineffective as an access control barrier for unauthenticated users.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WPBot – AI ChatBot for Live Support, Lead Generation, AI Services · quantumcloud
through 8.7.3 · source: vendor
Affected product
WA
WPBot – AI ChatBot for Live Support, Lead Generation, AI Services
quantumcloud
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83593
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83593
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/functions.php#L1922
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/includes/chat-sessions/js/admin.js#L86
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/includes/chat-sessions/wpbot-chat-sessions.php#L564
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/includes/chat-sessions/wpbot-chat-sessions.php#L566
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/includes/chat-sessions/wpbot-chat-sessions.php#L708
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.6/includes/chat-sessions/wpbot-chat-sessions.php#L866
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