NVD

CVE-2026-79670 Detail

Received

This CVE record has recently been published to the CVE List and has been included within the NVD dataset.

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: VulnCheck

CVSS-B 4.8 MEDIUM

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

CVSS 3.x Severity and Vector Strings:

CNA: VulnCheck

Base Score: 4.8 MEDIUM

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4	CISA-ADP, VulnCheck
https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload	VulnCheck

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-434	Unrestricted Upload of File with Dangerous Type	VulnCheck

Change History

2 change records found show changes

New CVE Received from VulnCheck 8/25/2026 8:16:35 AM

Action	Type	New Value
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.
Added	CVSS V4.0	AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Added	CVSS V3.1	AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Added	CWE	CWE-434
Added	Reference	https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4
Added	Reference	https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload
Added	Affected	[{"vendor":"lin-snow","product":"Ech0","defaultStatus":"unaffected","packageURL":"pkg:golang/github.com/lin-snow/ech0","versions":[{"version":"0","lessThan":"4.4.3","versionType":"semver","status":"affected"},{"version":"4.4.3","versionType":"semver","status":"unaffected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-79670
NVD Published Date:
08/25/2026
NVD Last Modified:
08/25/2026
Source:
VulnCheck

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Information Technology Laboratory

National Vulnerability Database