CVE-2026-81784

HIGH 8.1

WordPress Wise Chat plugin <= 3.4.2 - PHP Object Injection vulnerability

CVSS Score

8.1

EPSS Score

0.4%

EPSS Percentile

36th

Deserialization of Untrusted Data vulnerability in Marcin Wise Chat wise-chat allows Object Injection.This issue affects Wise Chat: from n/a through 3.4.2.

CWE	CWE-502
Vendor	marcin
Product	wise chat
Published	Sep 10, 2026
Last Updated	Oct 6, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Marcin / Wise Chat

0 ≤ 3.4.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

patchstack.com: https://patchstack.com/database/wordpress/plugin/wise-chat/vulnerability/wordpress-wise-chat-plugin-3-4-php-object-injection-vulnerability?_s_id=cve

Credits

Peng Zhou | Patchstack Bug Bounty Program