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Vulnerability record · CVE-2026-79667 · published 25 August 2026

CVE-2026-79667: Improper authorization vulnerability

Ech0 version 4.3.4 and earlier fails to reliably enforce scoped access token (least-privilege) restrictions on several privileged admin routes. Multiple privileged endpoints (e.g., /api/inbox, /api/panel/comments, /api/backup/export) omit scope checks and authorize based only on the user's admin role, and the backup export handler discards token scope metadata entirely. An attacker holding a deliberately limited (low-scope) admin access token can reach broader privileged functionality than intended, including reading the inbox and exporting a full database backup ZIP archive. Fixed in 4.4.3.

7.2 CVSS 4.0 High EPSS 0.32% · top 77.3% CWE-285 · Improper authorization Deferred
7.2CVSS 4.0 base score
0.32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
31 Aug 2026Last modified by NVD

Description

Ech0 version 4.3.4 and earlier fails to reliably enforce scoped access token (least-privilege) restrictions on several privileged admin routes. Multiple privileged endpoints (e.g., /api/inbox, /api/panel/comments, /api/backup/export) omit scope checks and authorize based only on the user's admin role, and the backup export handler discards token scope metadata entirely. An attacker holding a deliberately limited (low-scope) admin access token can reach broader privileged functionality than intended, including reading the inbox and exporting a full database backup ZIP archive. Fixed in 4.4.3.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/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:

References

LinkTags
https://github.com/lin-snow/Ech0/security/advisories/GHSA-4h9q-p5j4-xvvh
https://www.vulncheck.com/advisories/ech0-before-authentication-bypass-via-scope-enforcement
https://github.com/lin-snow/Ech0/security/advisories/GHSA-4h9q-p5j4-xvvh

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Source: NIST National Vulnerability Database (record CVE-2026-79667), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.