Quick answers
- Is CVE-2026-9548 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9548 being exploited in the wild.
- How severe is CVE-2026-9548?
- Medium severity, with a CVSS score of 6.5, published 28 August 2026.
- Which products and versions are affected?
- Synology Chat Server before 2.4.5-22148.
- Is there a fix for CVE-2026-9548?
- A patch was published on 2026-08-28: Vulnerability details disclosed; patch available in 2.4.5-22148 or above Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-9548 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9548?
- Check whether you run Synology Chat Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a reflected or stored XSS vulnerability (CWE-79) in the extract domain component of Synology Chat Server before version 2.4.5-22148. The vulnerability requires authentication and user interaction (UI interaction) to exploit. An attacker with valid credentials can craft a malicious input that executes arbitrary JavaScript in the context of a DSM session, allowing file access and limited denial-of-service actions. A patch is available in version 2.4.5-22148 and above.
Affected products
- Synology Chat Server before 2.4.5-22148
Timeline
- 2026-05-26: disclosed: Initial public release of advisory
- 2026-08-28: patched: Vulnerability details disclosed; patch available in 2.4.5-22148 or above