{"id":"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.","aliases":["GHSA-pj6q-4vq4-r8cg","GO-2026-5541"],"modified":"2026-08-28T03:30:47.373064117Z","published":"2026-08-25T11:33:25.369Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79661.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lin-snow/ech0","events":[{"introduced":"0"},{"fixed":"6ad621d8d461c58f1a1d179c4dfbb741803f8aa5"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.7.3"},{"introduced":"Ech0"},{"fixed":"4.5.6"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v4.7.2","ech0-4.7.2","v4.7.1","ech0-4.7.1","v4.7.0","ech0-4.7.0","v4.6.4","ech0-4.6.4","v4.6.3","ech0-4.6.3","v4.6.2","ech0-4.6.2","v4.6.1","ech0-4.6.1","v4.6.0","ech0-4.6.0","v4.5.6","ech0-4.5.6","v4.5.5","ech0-4.5.5","v4.5.4","ech0-4.5.4","v4.5.2","ech0-4.5.2","v4.5.1","ech0-4.5.1","ech0-4.5.0","v4.5.0","v4.4.6","v4.4.5","ech0-1.0.0","v4.4.4","v4.4.3","v4.4.2","v4.4.1","v4.4.0","v4.3.7","v4.3.6","v4.3.5","v4.3.4","v4.3.2","v4.3.1","v4.3.0","v4.2.8","v4.2.7","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0","v4.1.9","v4.1.8","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.2","v4.0.0","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.9","v3.0.8","v3.0.7","v3.0.6","v3.0.5","v2.9.2","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.3","v2.9.1","v2.9.0","v2.8.10","v2.8.9","v2.8.8","v2.8.7","v2.8.6","v2.8.5","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.10","v2.7.9","v2.7.8","v2.7.7","v2.7.6","v2.7.5","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.6.10","v2.6.9","v2.6.8","v2.6.7","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.10","v2.5.9","v2.5.8","v2.5.7","v2.5.6","v2.5.5","v2.5.4","v2.5.3","v2.5.1","v2.5.0","v2.4.9","v2.4.8","v2.4.7","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.9","v2.3.8","v2.3.7","v2.3.6","v2.3.5","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.9","v2.2.8","v2.2.7","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.10","v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.0","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.9","v1.3.8","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-79661.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}