{"id":"CVE-2026-79661","aliases":["GHSA-pj6q-4vq4-r8cg","GO-2026-5541"],"url":"https://o3.security/vulnerability/CVE-2026-79661","summary":"Ech0 before 4.7.3 Unauthenticated fav_count Modification","details":"Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET /api/echo/page feed. Repeated requests are accepted without deduplication, each triggering a database write and a four-key cache invalidation, allowing attackers to inflate popularity metrics and amplify load on the database and cache. Fixed in 4.7.3.","published":"2026-08-25T11:33:25.369Z","modified":"2026-09-02T03:30:33.888400434Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"github.com/lin-snow/Ech0","fixedVersion":"1.4.8-0.20260503035905-cecc2c19b590"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79661.json"},{"type":"ADVISORY","url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79661"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/ech0-before-unauthenticated-fav-count-modification"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-02T03:30:33.888400434Z"}}