{"schema":"threatline.record/2","record":{"id":"CVE-2026-86158","aliases":[],"summary":"Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere","details":"Missing authentication in the local .NET backend (Fiddler.WebUi) of Progress Software Fiddler Everywhere 8.0.2 allows a local unauthenticated attacker to mint OAuth tokens and read the machine-in-the-middle root certificate through an unauthenticated localhost HTTP and SignalR RPC channel.","categories":["Unclassified"],"product":"Progress® Telerik® Fiddler® Everywhere","vendor":"Progress Software","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-86158","source_modified_at":"2026-09-30T15:28:20.211Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Progress® Telerik® Fiddler® Everywhere","vendor":"Progress Software","versions":[{"status":"affected","version":"1.0.0","lessThan":"8.2.0","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-86158","source_modified_at":"2026-09-30T15:28:20.211Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Progress® Telerik® Fiddler® Everywhere","ecosystem":null},"version":"8.2.0","basis":"first unaffected version stated in the CVE record"}],"cvss":7.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00087,"percentile":0.00322,"score_date":"2026-10-23"},"published_at":"2026-09-29T06:34:24.264Z","modified_at":"2026-09-30T15:28:20.211Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-86158","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T15:28:20.211Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-86158","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-authentication-for-critical-function-cve-2026-86158","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-30T15:18:22.768601Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T15:28:20.211Z","content_hash":"e17876f0f38b393887e9f7260ee908c122266d0b83896a424d4c0e94a879107b"}}