{"id":"CVE-2026-23866","state":"PUBLISHED","title":"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 allo","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.","publishedAt":"2026-05-01T16:02:03.304Z","updatedAt":"2026-05-01T17:42:09.286Z","severity":{"score":4.3,"label":"Medium","version":"3.1","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","source":"Meta"},"assigner":"Meta","products":["Facebook WhatsApp for Android","Facebook WhatsApp for iOS"],"affected":[{"vendor":"Facebook","product":"WhatsApp for Android","defaultStatus":"unaffected","versions":[{"version":"2.25.8.0","status":"affected","lessThan":"2.26.7.10","versionType":"semver"}]},{"vendor":"Facebook","product":"WhatsApp for iOS","defaultStatus":"unaffected","versions":[{"version":"2.25.8.0","status":"affected","lessThan":"2.26.15.72","versionType":"semver"}]}],"references":["https://www.facebook.com/security/advisories/cve-2026-23866","https://www.whatsapp.com/security/advisories/2026"],"weaknesses":["CWE-940"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23866.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23866","state":"PUBLISHED","datePublished":"2026-05-01T16:02:03.304Z","dateUpdated":"2026-05-01T17:42:09.286Z","assignerShortName":"Meta","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateReserved":"2026-01-16T19:49:26.309Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"Facebook","product":"WhatsApp for Android","defaultStatus":"unaffected","versions":[{"version":"2.25.8.0","status":"affected","lessThan":"2.26.7.10","versionType":"semver"}]},{"vendor":"Facebook","product":"WhatsApp for iOS","defaultStatus":"unaffected","versions":[{"version":"2.25.8.0","status":"affected","lessThan":"2.26.15.72","versionType":"semver"}]}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-23866","tags":["x_refsource_CONFIRM"]},{"url":"https://www.whatsapp.com/security/advisories/2026","tags":["x_refsource_CONFIRM"]}],"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"}}],"problemTypes":[{"descriptions":[{"description":"Improper Verification of Source of a Communication Channel (CWE-940)","lang":"en"}]}],"providerMetadata":{"shortName":"Meta","orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateUpdated":"2026-05-01T16:10:25.306Z"},"dateAssigned":"2026-04-20T00:00:00.000Z"},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-940","type":"CWE","lang":"en","description":"CWE-940 Improper Verification of Source of a Communication Channel"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-01T17:42:09.286Z"}}]}}}