CVE-2026-2987 MEDIUM

CVE-2026-2987: Simple Ajax Chat <= 20260217 - Unauthenticated Stored Cross-Site Scripting via 'c'

Vendor Specialk
Product Simple Ajax Chat – Add a Fast, Secure Chat Box
Weakness CWE-79 · XSS
Published March 12, 2026
Last update April 8, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

The Simple Ajax Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'c' parameter in versions up to, and including, 20260217 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.

Explanation of Vulnerability in Simple Terms

02Summary

Simple Ajax Chat versions up to 20260217 contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into chat messages. The vulnerability requires user interaction—a victim must view a crafted message—but can affect other users and the site's integrity. Update to a version newer than the affected range to remediate.

What an attacker can do

03Attacker Capabilities

Inject malicious JavaScript into chat messages that executes in other users' browsers.

Potential impact on your site

04Site Impact

Chat users can be redirected, have sessions hijacked, or see defaced content without warning.

Conditions required to exploit

05Prerequisites

No authentication required. A victim must view the attacker's crafted chat message.

Key dates

06Disclosure timeline

March 12, 2026 CVE published
April 8, 2026 Record updated