Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity missing authentication in Ech0 from lin-snow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 62.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/lin-snow/ech0	1.4.8-0.20260503040728-a7e8b8e84bd1	GHSA-rgj7-vg8v-j4wr
Go	github.com/lin-snow/ech0	1.4.8-0.20260503040728-a7e8b8e84bd1	GO-2026-5623

Affected products (as reported)

Vendor	Product	Versions
lin-snow	Ech0	0 – before 4.7.3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-rgj7-vg8v-j4wr) vendor-advisory
VulnCheck Advisory: Ech0 before 4.7.3 Unauthenticated Like Endpoint Metric Inflation third-party-advisory