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TI-2026-08337 Aliases CVE-2026-9491GHSA-w5gw-c597-vxvj

Server-side request forgery in Synology Chat Server

Priority LOW 20CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00358 29th percentileScored 2026-11-07
Fix Fixed Synology Chat Server (Synology): 2.4.5-22148

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SynologySynology Chat Serverbefore 2.4.5-221482.4.5-22148Patch availableCNA
  • Synology Chat Server VendorSynology Affected before 2.4.5-22148 Fixed in 2.4.5-22148 Patch available CNA

Remediation

  • Fix · CNA Synology Chat Server (Synology) Fixed in 2.4.5-22148

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Synology Chat Server — Synology-SA-26:10 Synology Chat Server

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-29287 Cross-site scripting in Synology Chat ServerPriority MEDIUM 41
    • TI-2026-08390 Cross-site scripting in Synology Chat ServerPriority LOW 28
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-9491
  2. 2026-10-03 Alias added: GHSA-w5gw-c597-vxvj

References

Advisory 1

  • TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-02242 Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer… KEVCVSS 3.1HIGH 7.8
  • TI-2018-01076 Out-of-bounds write in Netatalk CVSS 3.1CRITICAL 9.8
  • TI-2017-10594 Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a… CVSS 3.1CRITICAL 9.8
  • TI-2013-05716 webman/imageSelector.cgi in Synology DiskStation Manager (DSM) 4.0 before 4.0-2259, 4.2… CVSS 2.0HIGH 10.0
  • TI-2021-19843 Out-of-bounds read in Samba CVSS 3.1HIGH 8.8
See all 374 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences