CVE-2026-79668

MEDIUM 5.3

Ech0 before 4.7.3 Unauthenticated Like Endpoint Metric Inflation

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-306
Vendor	lin-snow
Product	ech0
Published	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

lin-snow / Ech0

0 < 4.7.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/lin-snow/Ech0/security/advisories/GHSA-rgj7-vg8v-j4wr vulncheck.com: https://www.vulncheck.com/advisories/ech0-before-unauthenticated-like-endpoint-metric-inflation

Credits

🔍 VashuVats