{"schema":"threatline.record/2","record":{"id":"CVE-2026-109434","aliases":[],"summary":"Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing","details":"Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability that allows remote attackers to impersonate the browser's trusted address bar by entering fullscreen mode via the Fullscreen API without displaying a persistent notification or trusted-origin indicator. Attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content after a single user tap, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.","categories":["Unclassified"],"product":"Sleipnir Mobile for Android","vendor":"Fenrir","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109434","source_modified_at":"2026-10-19T18:36:45.158Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Sleipnir Mobile for Android","vendor":"Fenrir","versions":[{"status":"affected","version":"0","versionType":"semver","lessThan":"3.9.0"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109434","source_modified_at":"2026-10-19T18:36:45.158Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Sleipnir Mobile for Android","ecosystem":null},"version":"3.9.0","basis":"first unaffected version stated in the CVE record"}],"cvss":5.1,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00303,"percentile":0.21838,"score_date":"2026-10-23"},"published_at":"2026-10-19T18:12:51.637Z","modified_at":"2026-10-19T18:36:45.158Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109434","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T18:36:45.158Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109434","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.fenrir-inc.com/jp/news/2026/10/15/sleipnir-mobile-for-android-3-9-0/","tags":["vendor-advisory","patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/sleipnir-browser-fullscreen-address-bar-spoofing","tags":["third-party-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":"partial","assessed_at":"2026-10-19T18:36:32.278770Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-19T18:36:45.158Z","content_hash":"b36ed40b262089509a8f6b51fb86022b7c42929febe15cda766218b85cd6ff28"}}