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CVE-2026-9491

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之前版本存在服务端请求伪造漏洞，该漏洞源于webhook存在服务端请求伪造（SSRF）漏洞，可能导致远程认证用户获取非敏感信息。

CVSS 4.3 · Medium EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port

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-2026-9491

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A server-ide request forgery (SSRF) vulnerability in webhook in Synology Chat Server before 2.4.5-22148 allows remote authenticated users to obtain non-sensitive information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Synology Chat Server 服务端请求伪造漏洞
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之前版本存在服务端请求伪造漏洞，该漏洞源于webhook存在服务端请求伪造（SSRF）漏洞，可能导致远程认证用户获取非敏感信息。
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-2026-9491

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III. Intelligence Information for CVE-2026-9491

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Vendor Advisories for CVE-2026-9491 (1)

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

CVE-2026-40541 9.0 CRITICAL Synology Chat Server 跨站脚本漏洞
CVE-2026-9548 6.5 MEDIUM Synology Chat Server 跨站脚本漏洞

IV. Related Vulnerabilities

Same product: Synology Chat Server
Same vendor: Synology
Same weakness: CWE-918