CVE-2026-79670CWE-434unrestricted-file-upload

CVE-2026-79670

Medium · published August 25, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
15.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
4.8 · 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
EPSS
0.00251 · 15.7th percentile
Weakness
CWE-434 · Unrestricted Upload of File with Dangerous Type
Published
2026-08-25T16:16Z
References (3)
https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4 · [email protected]https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload · [email protected]https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 AUG 06:46Z
    EPSS moved — → 0%
    epss
  • 25 AUG 11:33Z
    Ech0 before 4.4.3 Stored XSS via SVG Upload
    cvelistv5