{"id":"CVE-2026-102877","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102877","generatedAt":"2026-10-28T05:28:06.108Z","title":"Fider before 0.38.0 contains a server-side request forgery vulnerability due to a time-of-check time-of-use gap in URL validation for webhooks and custom OAuth provider endpoints.","description":"Fider before 0.38.0 contains a server-side request forgery vulnerability due to a time-of-check time-of-use gap in URL validation for webhooks and custom OAuth provider endpoints. Administrators controlling DNS can perform DNS rebinding attacks to make the Fider server send requests to internal services or cloud metadata endpoints.","published":"2026-09-29T20:17:18.000Z","lastModified":"2026-09-30T20:17:25.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":2.1,"severity":"LOW","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-918"],"affected":[],"epss":{"score":0.00209,"percentile":0.11037,"date":"2026-10-27","history":[{"date":"2026-09-30","score":0.00209,"percentile":0.10053}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T20:17:18.000Z","detail":{"score":"2.1","severity":"LOW","publishedAt":"2026-09-29T20:17:18.433Z"},"summary":"New CVE, low severity (CVSS 2.1)."}],"references":[{"url":"https://github.com/getfider/fider","source":"disclosure@vulncheck.com"},{"url":"https://github.com/getfider/fider/blob/v0.37.0/app/pkg/validate/general.go","source":"disclosure@vulncheck.com"},{"url":"https://github.com/getfider/fider/blob/v0.37.0/app/services/httpclient/httpclient.go","source":"disclosure@vulncheck.com"},{"url":"https://github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69","source":"disclosure@vulncheck.com"},{"url":"https://github.com/getfider/fider/releases/tag/v0.38.0","source":"disclosure@vulncheck.com"},{"url":"https://github.com/getfider/fider/security/advisories/GHSA-whx4-hxwq-qgjh","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/fider-before-0.38.0-ssrf-via-dns-rebinding-in-webhook-validation","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102877","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}