CVE-2026-9548
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
CVE-2026-9548: improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server…
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
CVE-2026-9548 at a glance
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- Critical
- CVSS base score
- 6.5 (Synology)
- Fixed releases
- Synology: 2.4.5-22148
- Vendor advisories
- 2 from Synology
- VulniPulse record
- Published · Updated
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-9548; bulletin-wide values are not repeated here.
Is CVE-2026-9548 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-9548 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-9548?
Upgrade to a fixed release named by the vendor:
- Synology: 2.4.5-22148
- Upgrade the affected Synology product to a fixed release: 2.4.5-22148. (Synology)
Vendor advisory comparison
Synology
2 advisories- Advisory severityCritical9.0
Critical [CVE-2026-40541 +2] 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
Synology-SA-26:10Source published Source updated
This bulletin covers 3 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
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. Affected products named by the advisory: Synology Chat Server for DSM 7.3; Synology Chat Server for DSM 7.2.2; Synology Chat Server for DSM 7.2.1.
- Affected products in this advisory
- Synology Chat Server for DSM 7.3
- Synology Chat Server for DSM 7.2.2
- Synology Chat Server for DSM 7.2.1
- Source-reported affected versions
- before 2.4.5-22148
- Source-reported fixed versions
- 2.4.5-22148
- Mitigation guidance
- Upgrade the affected Synology product to a fixed release: 2.4.5-22148.
- Advisory severityMedium6.5
Medium [CVE-2026-9548] 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
CVE-2026-9548Source published Source updated
Synology has released a security update for the Synology Chat Server package in DSM to address multiple vulnerabilities: CVE-2026-40541 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks. CVE-2026-9491 allows remote authenticated users to obtain non-sensitive information. Please refer to the ' Affected products named by the advisory: Synology Chat Server for DSM 7.3; Synology Chat Server for DSM 7.2.2; Synology Chat Server for DSM 7.2.1.
- Affected products in this advisory
- Synology Chat Server for DSM 7.3
- Synology Chat Server for DSM 7.2.2
- Synology Chat Server for DSM 7.2.1
- Source-reported affected versions
- Synology Chat Server for DSM 7.3 before 2.4.5-22148
- Synology Chat Server for DSM 7.2.2 before 2.4.5-22148
- Synology Chat Server for DSM 7.2.1 before 2.4.5-22148
- Source-reported fixed versions
- 2.4.5-22148
- Mitigation guidance
- Upgrade the affected Synology product to a fixed release: 2.4.5-22148.
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