{"cve":"CVE-2026-55040","nvd":{"published":"2026-07-14T18:18:15.413","modified":"2026-08-19T04:17:23.540","status":"Analyzed","description":"Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-1390"],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040","https://github.com/sfewer-r7/CVE-2026-55040","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55040","https://www.rapid7.com/blog/post/ra-microsoft-sharepoint-jwt-token-authentication-bypass-cve-2026-55040/"],"products":["microsoft:sharepoint_server"],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-55040","score":0.69536,"percentile":0.99363,"date":"2026-10-31"},"kev":{"cve":"CVE-2026-55040","date_added":"2026-08-18","due_date":"2026-08-21","vendor":"Microsoft","product":"SharePoint","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}