{"@odata.context":"https://api.msrc.microsoft.com/sug/v2.0/sugodata/v2.0/en-US/$metadata#vulnerability/$entity","id":"00000000-0000-0000-0000-00000676646c","releaseDate":"2026-10-13T07:00:00-07:00","cveNumber":"CVE-2026-88156","cveTitle":"Microsoft Office Outlook Remote Code Execution Vulnerability","releaseNumber":"2026-Oct","vulnType":"Security Vulnerability","latestRevisionDate":"2026-10-15T07:00:00-07:00","description":"<p>Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.</p>\n","cweList":["CWE-121: Stack-based Buffer Overflow"],"cweDetailsListForSearch":["cwe: CWE-121: Stack-based Buffer Overflow","cweUrl: https://cwe.mitre.org/data/definitions/121.html"],"unformattedDescription":"<p>Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.</p>","mitreText":"CVE-2026-88156","mitreUrl":"https://www.cve.org/CVERecord?id=CVE-2026-88156","publiclyDisclosed":"No","exploited":"No","latestSoftwareReleaseId":2,"latestSoftwareRelease":"Exploitation Less Likely","olderSoftwareReleaseId":0,"denialOfService":"N/A","tag":"Microsoft Office Outlook","issuingCna":"Microsoft","issuingCnaId":100000001,"severityId":100000000,"severity":"Critical","impactId":100000005,"impact":"Remote Code Execution","langCode":"en-US","baseScore":"9.8","temporalScore":"8.5","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","vectorStringSource":"Microsoft","isMariner":false,"customerActionRequired":true,"customerActionRequiredId":1,"cweDetailsList":[{"keys":["cwe","cweUrl"],"values":["CWE-121: Stack-based Buffer Overflow","https://cwe.mitre.org/data/definitions/121.html"]}],"articles":[{"articleType":"FAQ","description":"<p><strong>How could an attacker exploit this vulnerability?</strong></p>\n<p>An attacker could send a specially crafted email message to a target user. Simply viewing the message in the Outlook Reading Pane could trigger the vulnerability, without the recipient opening the message or clicking anything in it. Successful exploitation could allow the attacker to execute code on the recipient's system. Network access is required; authentication and user interaction are not required.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>Are the updates for Microsoft Office LTSC for Mac 2021 and 2024 currently available?</strong></p>\n<p>Yes. As of October 15, 2025, the security update for Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac are available. Customers running Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac should ensure the update is installed to be protected from this vulnerability.</p>\n","ordinal":10000},{"title":"Microsoft Office Outlook Remote Code Execution Vulnerability","articleType":"100000000","description":"<p>Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.</p>\n","ordinal":10000},{"title":"Microsoft Office Outlook Remote Code Execution Vulnerability","articleType":"100000000","description":"<p>Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>Is the Preview Pane an attack vector for this vulnerability?</strong></p>\n<p>Yes, the Preview Pane is an attack vector.</p>\n","ordinal":10000}],"revisions":[{"cveNumber":"CVE-2026-88156","version":1.1,"revisionDate":"2026-10-15T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any action. See the <a href=\"https://go.microsoft.com/fwlink/p/?linkid=831049\">Release Notes</a> for more information and download links.</p>\n","unformattedDescription":"Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any action. See the [Release Notes](https://go.microsoft.com/fwlink/p/?linkid=831049) for more information and download links.","notificationNeeded":false,"notificationSent":false,"sourceId":"85f72c7d-c9c8-f111-aaae-000d3a5aa3a1"},{"cveNumber":"CVE-2026-88156","version":1,"revisionDate":"2026-10-13T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published.</p>\n","unformattedDescription":"Information published.","notificationNeeded":false,"notificationSent":false,"sourceId":"03ce32bb-e5b5-f111-93a1-000d3ac5fb71"}]}