{"cve":"CVE-2026-79668","nvd":{"published":"2026-08-25T12:16:34.967","modified":"2026-08-31T20:38:54.340","status":"Deferred","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-306"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-79668","score":0.00434,"percentile":0.37711,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rgj7-vg8v-j4wr","url":"https://osv.dev/vulnerability/GHSA-rgj7-vg8v-j4wr","summary":"Ech0's Unauthenticated Like Endpoint Enables Arbitrary Engagement Metric Inflation","modified":"2026-08-27T04:10:42.343289238Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<1.4.8-0.20260503040728-a7e8b8e84bd1"],"fixed":["1.4.8-0.20260503040728-a7e8b8e84bd1"]}]},{"id":"GO-2026-5623","url":"https://osv.dev/vulnerability/GO-2026-5623","summary":"Ech0's Unauthenticated Like Endpoint Enables Arbitrary Engagement Metric Inflation in github.com/lin-snow/ech0","modified":"2026-08-27T04:10:42.343289238Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<1.4.8-0.20260503040728-a7e8b8e84bd1"],"fixed":["1.4.8-0.20260503040728-a7e8b8e84bd1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}