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.

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History

Tue, 25 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Lin-snow
Lin-snow ech0
Vendors & Products Lin-snow
Lin-snow ech0

Tue, 25 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title Ech0 before 4.4.3 Stored XSS via SVG Upload
First Time appeared Ech0
Ech0 ech0
Weaknesses CWE-434
CPEs cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*
Vendors & Products Ech0
Ech0 ech0
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-25T17:30:32.633Z

Reserved: 2026-08-25T11:10:13.697Z

Link: CVE-2026-79670

cve-icon Vulnrichment

Updated: 2026-08-25T17:30:09.915Z

cve-icon NVD

Status : Received

Published: 2026-08-25T12:16:35.247

Modified: 2026-08-25T18:18:06.300

Link: CVE-2026-79670

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T13:15:13Z

Weaknesses