CVE-2026-23863

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23863", "assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827", "state": "PUBLISHED", "assignerShortName": "Meta", "dateReserved": "2026-01-16T19:49:26.308Z", "datePublished": "2026-05-01T16:01:39.565Z", "dateUpdated": "2026-05-01T17:41:14.681Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "WhatsApp Desktop for Windows", "vendor": "Facebook", "versions": [{"lessThan": "2.3000.1032164386.258709", "status": "affected", "version": "2.3000.*.252500", "versionType": "custom"}]}], "dateAssigned": "2026-04-20T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild."}], "problemTypes": [{"descriptions": [{"description": "Improper Neutralization of Null Byte or NUL Character (CWE-158)", "lang": "en"}]}], "providerMetadata": {"orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827", "shortName": "Meta", "dateUpdated": "2026-05-01T16:15:38.171Z"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://www.facebook.com/security/advisories/cve-2026-23863"}, {"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:N/UI:R/S:U/C:N/I:H/A:N/E:F/RL:O/RC:C", "baseScore": 6.5, "baseSeverity": "MEDIUM"}}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-158", "lang": "en", "description": "CWE-158 Improper Neutralization of Null Byte or NUL Character"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-01T17:40:45.569668Z", "id": "CVE-2026-23863", "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": "2026-05-01T17:41:14.681Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23863", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-01T17:40:45.569668Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-158", "description": "CWE-158 Improper Neutralization of Null Byte or NUL Character"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-01T17:41:10.404Z"}}], "cna": {"metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 6.5, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:F/RL:O/RC:C"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Facebook", "product": "WhatsApp Desktop for Windows", "versions": [{"status": "affected", "version": "2.3000.*.252500", "lessThan": "2.3000.1032164386.258709", "versionType": "custom"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://www.facebook.com/security/advisories/cve-2026-23863", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://www.whatsapp.com/security/advisories/2026", "tags": ["x_refsource_CONFIRM"]}], "dateAssigned": "2026-04-20T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Neutralization of Null Byte or NUL Character (CWE-158)"}]}], "providerMetadata": {"orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827", "shortName": "Meta", "dateUpdated": "2026-05-01T16:15:38.171Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23863", "state": "PUBLISHED", "dateUpdated": "2026-05-01T17:41:14.681Z", "dateReserved": "2026-01-16T19:49:26.308Z", "assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827", "datePublished": "2026-05-01T16:01:39.565Z", "assignerShortName": "Meta"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "WhatsApp Desktop for Windows", "vendor": "Facebook", "versions": [{"lessThan": "2.3000.1032164386.258709", "status": "affected", "version": "2.3000.*.252500", "versionType": "custom"}]}], "source": "cve-assign@fb.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:windows:*:*", "matchCriteriaId": "1E1C0BD0-0D92-438F-AB63-A267635A5FDF", "versionEndExcluding": "2.3000.1032164386.258709", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild."}, {"lang": "es", "value": "Un problema de suplantaci\u00f3n de archivos adjuntos en WhatsApp para Windows anterior a la v2.3000.1032164386.258709 podr\u00eda haber permitido que documentos con formato malicioso con bytes NUL incrustados en el nombre de archivo se mostraran en la aplicaci\u00f3n como un tipo de archivo, pero se ejecutaran como un archivo ejecutable al abrirse. No hemos visto evidencia de explotaci\u00f3n en la pr\u00e1ctica."}], "id": "CVE-2026-23863", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "cve-assign@fb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23863", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-01T17:40:45.569668Z", "version": "2.0.3"}}]}, "published": "2026-05-01T16:16:29.843", "references": [{"source": "cve-assign@fb.com", "tags": ["Third Party Advisory"], "url": "https://www.facebook.com/security/advisories/cve-2026-23863"}, {"source": "cve-assign@fb.com", "tags": ["Vendor Advisory"], "url": "https://www.whatsapp.com/security/advisories/2026"}], "sourceIdentifier": "cve-assign@fb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-158"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3000.*.252500,2.3000.1032164386.258709)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "WhatsApp Desktop for Windows", "source": "cna", "vendor": "Facebook"}, "product": "whatsapp_desktop", "vendor": "whatsapp"}], "created": "2026-05-01T23:00:14.035350+00:00", "title": "WhatsApp Windows Filename Spoofing Leading to Potential Execution of Malicious Payload", "updated": "2026-05-04T16:07:31.818902+00:00", "vendors": ["whatsapp", "whatsapp$PRODUCT$whatsapp_desktop"], "weaknesses": ["CWE-158"]}