CVE-2026-66636

WordPress Wise Chat plugin <= 3.4.3 - Cross Site Scripting (XSS) vulnerability

6.5 Medium

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Stored XSS.This issue affects Wise Chat: from n/a through 3.4.3.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: Low

Exploit likelihood

0.22%Unchanged since Aug 19, 2026

What each source reports

CVE List Score used 6.5

WordPress Wise Chat plugin <= 3.4.3 - Cross Site Scripting (XSS) vulnerability

Record: CVE-2026-66636
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-60921 6.5

Record: EUVD-2026-60921
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-hxx2-grcw-j9mq 6.5

Contributor Cross Site Scripting (XSS) in Wise Chat <= 3.4 versions.

Contributor Cross Site Scripting (XSS) in Wise Chat <= 3.4 versions.

Record: GHSA-hxx2-grcw-j9mq
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.5

Record: CVE-2026-66636
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-66636 is a medium vulnerability (CVSS 6.5) in Marcin Wise Chat, published August 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 13th percentile. No source names a fixed version.