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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.

Synology Chat Server是中国Synology公司的一个团队协作即时通讯服务器。 Synology Chat Server 2.4.5-22148之前版本存在跨站脚本漏洞，该漏洞源于网页生成期间输入中和不当，可能导致远程认证用户通过UI交互读取或写入任意文件并导致拒绝服务攻击。

CVSS 9.0 · Critical EPSS 0.49% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
Synology Synology Chat Server *< 2.4.5-22148 affected
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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
Vulnerability Title
Synology Chat Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Synology Chat Server是中国Synology公司的一个团队协作即时通讯服务器。 Synology Chat Server 2.4.5-22148之前版本存在跨站脚本漏洞，该漏洞源于网页生成期间输入中和不当，可能导致远程认证用户通过UI交互读取或写入任意文件并导致拒绝服务攻击。
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
Synology Synology Chat Server * ~ 2.4.5-22148 -

II. Public POCs for CVE-2026-40541

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III. Intelligence Information for CVE-2026-40541

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Vendor Advisories for CVE-2026-40541 (1)

Same Patch Batch · Synology · 2026-08-28 · 3 CVEs total

CVE-2026-9548 6.5 MEDIUM Synology Chat Server 跨站脚本漏洞
CVE-2026-9491 4.3 MEDIUM Synology Chat Server 服务端请求伪造漏洞

IV. Related Vulnerabilities

Same product: Synology Chat Server
Same vendor: Synology
Same weakness: CWE-79