{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23866","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","state":"PUBLISHED","assignerShortName":"Meta","dateReserved":"2026-01-16T19:49:26.309Z","datePublished":"2026-05-01T16:02:03.304Z","dateUpdated":"2026-05-01T17:42:09.286Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"WhatsApp for Android","vendor":"Facebook","versions":[{"lessThan":"2.26.7.10","status":"affected","version":"2.25.8.0","versionType":"semver"}]},{"defaultStatus":"unaffected","product":"WhatsApp for iOS","vendor":"Facebook","versions":[{"lessThan":"2.26.15.72","status":"affected","version":"2.25.8.0","versionType":"semver"}]}],"dateAssigned":"2026-04-20T00:00:00.000Z","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"description":"Improper Verification of Source of a Communication Channel (CWE-940)","lang":"en"}]}],"providerMetadata":{"orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","shortName":"Meta","dateUpdated":"2026-05-01T16:10:25.306Z"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://www.facebook.com/security/advisories/cve-2026-23866"},{"tags":["x_refsource_CONFIRM"],"url":"https://www.whatsapp.com/security/advisories/2026"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"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","baseScore":4.3,"baseSeverity":"MEDIUM"}}]},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-940","lang":"en","description":"CWE-940 Improper Verification of Source of a Communication Channel"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-01T17:41:43.060585Z","id":"CVE-2026-23866","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-01T17:42:09.286Z"}}]}}