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    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 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.

    Published:Aug 25, 2026
    Last Modified:Aug 25, 2026
    EPS:Aug 25, 2026
    EPSS Score:
    CVSS Score:4.8

    Affected Products

    Vendor
    Ech0
    Product
    Ech0
    Vendor
    Lin-snow
    Product
    Ech0

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs

    Related CVEs

    CVE-2026-79673 (CVSS 8.5) — Ech0 before 4.4.3 protects the PUT /user endpoint with the profile:read scope, a read-only scope, but allows w…
    CVE-2026-79672 (CVSS 7) — Ech0 before 4.4.3 fails to enforce scope-based authorization on nine comment panel admin endpoints, allowing a…
    CVE-2026-79671 (CVSS 5.1) — Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (web…
    CVE-2026-79669 (CVSS 5.3) — Ech0 before 4.4.3 lacks authorization checks on system log endpoints allowing any authenticated non-admin user…
    CVE-2026-79668 (CVSS 6.9) — Ech0 before 4.7.3 contains an authentication bypass vulnerability in the PUT /api/echo/like/:id endpoint that …
    CVE-2026-79667 (CVSS 7.2) — Ech0 version 4.3.4 and earlier fails to reliably enforce scoped access token (least-privilege) restrictions on…
    CVE-2026-79666 (CVSS 7.1) — Ech0 before 4.4.3 fails to enforce administrator authorization on dashboard log endpoints, allowing any authen…
    CVE-2026-79665 (CVSS 8.7) — Ech0 before 4.5.1 contains an authorization bypass vulnerability where session tokens skip scope validation in…
    CVE-2026-79664 (CVSS 9.1) — Ech0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers …
    CVE-2026-79663 (CVSS 4.8) — Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High