CVE-2026-79670: Unrestricted Upload of File with Dangerous Type in lin-snow Ech0
Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.
CVE-2026-79670: Unrestricted Upload of File with Dangerous Type in lin-snow Ech0
Description
Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.
CVSS v4.0
Score 4.8medium
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-25T11:10:13.697Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8d820eacd9273b49225446
Added to database: 08/25/2026, 11:52:46 UTC
Last updated: 08/25/2026, 13:07:24 UTC
Views: 5
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