MEDIUM 4.8 NVD
CVE-2026-79670
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 header
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.
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4
- https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload
This medium severity vulnerability with a CVSS score of 4.8 was published on 2026-08-25 via NVD.
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