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    CVE-2026-79663

    Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS readers that render HTML-type summaries, affecting anonymous subscribers and other users.

    Published:Aug 25, 2026
    Last Modified:Aug 26, 2026
    EPS:Aug 25, 2026
    EPSS Score:0.00148
    CVSS Score:4.8

    Affected Products

    Vendor
    Ech0
    Product
    Ech0
    Vendor
    Lin-snow
    Product
    Ech0

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-79670 (CVSS 4.8) — Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that valida…
    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 …

    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