{"schemaVersion":3,"id":"CVE-2026-23866","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25.8.0 to v2.26.15.72 and WhatsApp for Android v2.25.8.0 to v2.26.7.10 could have allowed a user to trigger processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild.","dates":{"published":"2026-05-01T16:02:03.304Z","modified":"2026-05-01T17:42:09.286Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00464,"percentile":0.38924,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00464},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00464,"percentile":0.38924}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00464,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00464,"percentile":0.38924}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-940","name":"Improper Verification of Source of a Communication Channel","description":"The product establishes a communication channel to handle an incoming request that has been initiated by an actor, but it does not properly verify that the request is coming from the expected origin.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/940.html"}],"affected":[{"vendor":"facebook","product":"whatsapp for android","name":"WhatsApp for Android","label":"whatsapp for android","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.25.8.0, < 2.26.7.10","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.25.8.0, < 2.26.7.10","eol":null,"hubHref":"/vendor/facebook/whatsapp_for_android"},{"vendor":"facebook","product":"whatsapp for ios","name":"WhatsApp for iOS","label":"whatsapp for ios","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.25.8.0, < 2.26.15.72","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.25.8.0, < 2.26.15.72","eol":null,"hubHref":"/vendor/facebook/whatsapp_for_ios"},{"vendor":"whatsapp","product":"whatsapp","name":"whatsapp","label":"whatsapp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.25.8.0, ≤ 2.26.7.10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.25.8.0, ≤ 2.26.15.72","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.25.8.0, ≤ 2.26.7.10 | ≥ 2.25.8.0, ≤ 2.26.15.72","eol":null,"hubHref":"/vendor/whatsapp/whatsapp"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-23866","label":"www.facebook.com/security/advisories/cve-2026-23866","hostname":"www.facebook.com","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"https://www.whatsapp.com/security/advisories/2026","label":"www.whatsapp.com/security/advisories/2026","hostname":"www.whatsapp.com","tags":["X Refsource CONFIRM","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-01T16:02:03.304Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-01T17:42:09.286Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":17,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T03:45:53.887Z","stale":false,"partial":false}}