{"@odata.context":"https://api.msrc.microsoft.com/sug/v2.0/sugodata/v2.0/en-US/$metadata#vulnerability/$entity","id":"00000000-0000-0000-0000-0000d401cecc","releaseDate":"2026-05-07T07:00:00-07:00","cveNumber":"CVE-2026-26129","cveTitle":"M365 Copilot Information Disclosure Vulnerability","releaseNumber":"2026-May","vulnType":"Security Vulnerability","latestRevisionDate":"2026-05-07T07:00:00-07:00","description":"<p>Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.</p>\n","cweList":["CWE-138: Improper Neutralization of Special Elements"],"cweDetailsListForSearch":["cwe: CWE-138: Improper Neutralization of Special Elements","cweUrl: https://cwe.mitre.org/data/definitions/138.html"],"unformattedDescription":"Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","mitreText":"CVE-2026-26129","mitreUrl":"https://www.cve.org/CVERecord?id=CVE-2026-26129","publiclyDisclosed":"No","exploited":"No","latestSoftwareReleaseId":4,"latestSoftwareRelease":"N/A","olderSoftwareReleaseId":0,"denialOfService":"N/A","tag":"M365 Copilot","issuingCna":"Microsoft","issuingCnaId":100000001,"severityId":100000000,"severity":"Critical","impactId":100000003,"impact":"Information Disclosure","langCode":"en-US","baseScore":"7.5","temporalScore":"6.5","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","vectorStringSource":"Microsoft","isMariner":false,"customerActionRequired":false,"customerActionRequiredId":2,"cweDetailsList":[{"keys":["cwe","cweUrl"],"values":["CWE-138: Improper Neutralization of Special Elements","https://cwe.mitre.org/data/definitions/138.html"]}],"articles":[{"articleType":"FAQ","description":"<p><strong>Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?</strong></p>\n<p>This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.</p>\n<p>Please see <a href=\"https://aka.ms/MSRC-Cloud-CVEs\">Toward greater transparency: Unveiling Cloud Service CVEs</a> for more information.</p>\n","ordinal":10000},{"title":"M365 Copilot Information Disclosure Vulnerability","articleType":"100000000","description":"<p>Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.</p>\n","ordinal":10000}],"revisions":[{"cveNumber":"CVE-2026-26129","version":1,"revisionDate":"2026-05-07T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published.</p>\n","unformattedDescription":"Information published.","notificationNeeded":true,"notificationSent":true,"sourceId":"58f1a487-b10e-f111-939a-000d3ac5fb71"}]}