CVE-2026-40541 json
An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Se…
published 2026-08-28 2 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-67461
- cvss
- 9.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Synology Synology Chat Server 2.4.5-22148
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
Affected products
- Synology Synology Chat Server
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
synology.com
/en-global/security/advisory/Synology_SA_26_10
vendor-advisory
Sources
- CVE List CVE-2026-40541
- NVD CVE-2026-40541
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