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CVE-2026-79670

Ech0 before 4.4.3 Stored XSS via SVG Upload

MEDIUM
4.8
CVSS Score
Published: August 25, 2026 at 11:33 AM UTC
Updated: August 31, 2026 at 09:06 PM UTC
1 product affected across 1 vendorEch0

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ech0· Lin Snow
60%
v < 4.4.3
Vendor states this is fixed in 4.4.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-434

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