{"id":"CVE-2026-23866","aliases":["EUVD-2026-26666","GHSA-4x7f-p792-g362"],"status":"published","title":"Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25...","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.","severity":{"version":"3.1","score":4.3,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00471,"percentile":0.41068,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-940"],"published":"2026-05-01T16:02:03Z","modified":"2026-10-26T21:10:00Z","products":[{"vendor":"facebook","product":"whatsapp for android"},{"vendor":"facebook","product":"whatsapp for ios"},{"vendor":"whatsapp","product":"whatsapp"}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-23866","tags":["x_refsource_CONFIRM","Third Party Advisory"]},{"url":"https://www.whatsapp.com/security/advisories/2026","tags":["x_refsource_CONFIRM","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23866"},{"url":"https://github.com/advisories/GHSA-4x7f-p792-g362"}],"sources":{"cve":[{"id":"CVE-2026-23866","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.","status":"published","published":"2026-05-01T16:02:03.304Z","modified":"2026-05-01T17:42:09.286Z","cvss":[{"version":"3.1","score":4.3,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T13:42:26.790871Z"}],"euvd":[{"id":"EUVD-2026-26666","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.","status":"published","published":"2026-05-01T16:02:03Z","modified":"2026-05-01T17:42:09Z","cvss":[{"version":"3.1","score":4.3,"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","level":"medium"}],"updated_at":"2026-11-02T19:05:18.340967Z"}],"ghsa":[{"id":"GHSA-4x7f-p792-g362","title":"Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25...","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.","status":"published","published":"2026-05-01T18:31:24Z","modified":"2026-05-01T18:31:31Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T15:07:52.84276Z"}],"nvd":[{"id":"CVE-2026-23866","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.","status":"published","published":"2026-05-01T16:16:29.98Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T14:12:17.022502Z"}]}}