{"id":"CVE-2026-79661","state":"PUBLISHED","title":"Ech0 before 4.7.3 Unauthenticated fav_count Modification","description":"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.","publishedAt":"2026-08-25T11:33:25.369Z","updatedAt":"2026-08-27T15:10:35.322Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["lin-snow Ech0"],"affected":[{"vendor":"lin-snow","product":"Ech0","packageURL":"pkg:golang/github.com/lin-snow/Ech0","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.7.3","versionType":"semver"},{"version":"4.7.3","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg","https://www.vulncheck.com/advisories/ech0-before-unauthenticated-fav-count-modification"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/79xxx/CVE-2026-79661.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79661","state":"PUBLISHED","datePublished":"2026-08-25T11:33:25.369Z","dateUpdated":"2026-08-27T15:10:35.322Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-25T11:09:11.171Z"},"containers":{"cna":{"title":"Ech0 before 4.7.3 Unauthenticated fav_count Modification","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"lin-snow","product":"Ech0","packageURL":"pkg:golang/github.com/lin-snow/Ech0","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.7.3","versionType":"semver"},{"version":"4.7.3","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-pj6q-4vq4-r8cg)"},{"url":"https://www.vulncheck.com/advisories/ech0-before-unauthenticated-fav-count-modification","name":"VulnCheck Advisory: Ech0 before 4.7.3 Unauthenticated fav_count Modification","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-25T11:33:25.369Z"},"datePublic":"2026-05-03T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*","versionEndExcluding":"4.7.3"}]}]}],"credits":[{"lang":"en","value":"adrgs","type":"reporter"},{"lang":"en","value":"aisafe-bot","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T15:09:14.373295Z","id":"CVE-2026-79661","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T15:10:35.322Z"}}]}}}