What’s Vulnerable › Vulnerabilities

CVE-2026-79668: Ech0 before 4.7.3 Unauthenticated Like Endpoint Metric Inflation

• 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-306

Description

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.

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-rgj7-vg8v-j4wr
• https://www.vulncheck.com/advisories/ech0-before-unauthenticated-like-endpoint-metric-inflation

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