Auth bypass in Lin-Snow Ech0
CVE-2026-79668
Ech0 before 4.7.3 contains an authentication bypass vulnerability in the PUT /api/echo/like/:id endpoint that allows unauthenticated attackers to increment engagement metrics without identity verification or rate limiting. Attackers can send repeated requests to arbitrarily inflate the fav_count field for any known echo identifier, compromising the integrity of engagement metrics and social ranking systems.
Vulnerability class: Broken Authentication
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79668?
- CVE-2026-79668 is a medium-severity vulnerability in Lin-Snow Ech0, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-08-25.
- How severe is CVE-2026-79668?
- Medium severity. CVSS v3 base score is 5.3 out of 10.