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

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-08-31
Weakness: CWE-200

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.

Affected products

lin-snow Ech0: before 4.7.3 — fixed in 4.7.3

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.7.3. Check the vendor advisory for mitigations.

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
https://github.com/lin-snow/Ech0/security/advisories/GHSA-rj4g-rqgh-rx9h

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