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CVE-2026-81825— Simple Ajax Chat <= 20260811 - Unauthenticated Stored Cross-Site Scripting

Quick assessment

Affected
specialk Simple Ajax Chat – Add a Fast, Secure Chat Box
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Simple Ajax Chat是WordPress基金会开源的一款基于Ajax实现网页即时聊天功能的轻量工具。 WordPress Simple Ajax Chat 20260811及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，导致存储型跨站脚本，未认证攻击者可通过聊天消息注入任意Web脚本，脚本在用户访问注入页面时执行；保护聊天消息提交的随机数公开可见，使其无法作为身份验证屏障，攻击者可持久存储恶意消息并渲染给所有访问者。

CVSS 7.2 · High EPSS 0.49% · P42

Possible ATT&CK Techniques 1 AI

T1059.003 · Windows Command Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
specialk Simple Ajax Chat – Add a Fast, Secure Chat Box ≤ 20260811 affected
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I. Basic Information for CVE-2026-81825

Vulnerability Information
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Vulnerability Title
Simple Ajax Chat <= 20260811 - Unauthenticated Stored Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple Ajax Chat – Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Chat Message in all versions up to, and including, <= 20260811 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 nonce protecting chat message submission is publicly visible on the chat page, rendering it ineffective as an authentication barrier and allowing fully unauthenticated attackers to submit malicious messages that are stored persistently and rendered to all visitors on every page load.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Simple Ajax Chat 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Simple Ajax Chat是WordPress基金会开源的一款基于Ajax实现网页即时聊天功能的轻量工具。 WordPress Simple Ajax Chat 20260811及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，导致存储型跨站脚本，未认证攻击者可通过聊天消息注入任意Web脚本，脚本在用户访问注入页面时执行；保护聊天消息提交的随机数公开可见，使其无法作为身份验证屏障，攻击者可持久存储恶意消息并渲染给所有访问者。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
specialk Simple Ajax Chat – Add a Fast, Secure Chat Box 0 ~ 20260811 -

II. Public POCs for CVE-2026-81825

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III. Intelligence Information for CVE-2026-81825

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Patches & Fixes for CVE-2026-81825 (1)

Vendor Advisories for CVE-2026-81825 (1)

Vendor Pages for CVE-2026-81825 (2)

Other References for CVE-2026-81825 (1)

IV. Related Vulnerabilities

Same product: Simple Ajax Chat – Add a Fast, Secure Chat Box
Same vendor: specialk
Same weakness: CWE-79