CVE-2026-40541
Quick assessment
Affected
Synology Synology Chat Server
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.
在 Synology Chat Server 2.4.5-22148 之前的版本中，由于在生成网页时未正确中和输入数据（即存在“跨站脚本”漏洞），允许远程已认证用户通过 UI 交互读取或写入任意文件，并可在 DSM 中发起拒绝服务（DoS）攻击。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40541
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write arbitrary files and conduct denial-of-service attacks in DSM.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Synology | Synology Chat Server | * ~ 2.4.5-22148 | - |
|
II. Public POCs for CVE-2026-40541
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-40541 (1)
-
🔗 Synology_SA_26_10 | Synology Inc. vendor-advisory
Same Patch Batch · Synology · 2026-08-28 · 3 CVEs total
| CVE-2026-9548 | 6.5 MEDIUM | Synology Chat Server 2.4.5前XSS及文件读写漏洞 |
| CVE-2026-9491 | 4.3 MEDIUM | Synology Chat Server 2.4.5前Webhook存在SSRF漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-40541
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