{"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\u2019s 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"}}]}}

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{"cveTags": [], "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\u2019s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild."}], "id": "CVE-2026-23866", "lastModified": "2026-05-01T17:16:21.490", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "cve-assign@fb.com", "type": "Secondary"}]}, "published": "2026-05-01T16:16:29.980", "references": [{"source": "cve-assign@fb.com", "url": "https://www.facebook.com/security/advisories/cve-2026-23866"}, {"source": "cve-assign@fb.com", "url": "https://www.whatsapp.com/security/advisories/2026"}], "sourceIdentifier": "cve-assign@fb.com", "vulnStatus": "Received"}

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