CVE-2026-79670
Ech0 before 4.4.3 Stored XSS via SVG Upload
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-434 |
| Vendor | lin-snow |
| Product | ech0 |
| Published | Aug 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
lin-snow / Ech0
0 < 4.4.3
References
Credits
🔍 offset