{"id":"CVE-2026-50522","aliases":["EUVD-2026-43767","GHSA-ww8x-9jc5-9v7f"],"status":"published","title":"Microsoft SharePoint Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":9.8,"vector":"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.03042,"percentile":0.87712,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-502"],"published":"2026-07-14T17:05:27Z","modified":"2026-11-01T17:33:04Z","kev":{"date_added":"2026-07-22","due_date":"2026-07-25","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-07-22"},{"source":"kev","since":"2026-07-22"}],"exploits":[{"source":"pocgithub","id":"HORKimhab/CVE-2026-50522","title":"HORKimhab/CVE-2026-50522","date":"2026-07-22","url":"https://github.com/HORKimhab/CVE-2026-50522"},{"source":"pocgithub","id":"4minx/CVE-2026-50522","title":"4minx/CVE-2026-50522","date":"2026-07-25","url":"https://github.com/4minx/CVE-2026-50522"},{"source":"pocgithub","id":"WismanSec/sharepoint-2026-poc","title":"WismanSec/sharepoint-2026-poc","date":"2026-07-26","url":"https://github.com/WismanSec/sharepoint-2026-poc"},{"source":"pocgithub","id":"ChPratik/CVE-2026-50522","title":"ChPratik/CVE-2026-50522","date":"2026-07-27","url":"https://github.com/ChPratik/CVE-2026-50522"},{"source":"pocgithub","id":"darses/CVE-2026-50522","title":"darses/CVE-2026-50522","date":"2026-07-28","url":"https://github.com/darses/CVE-2026-50522"}],"products":[{"vendor":"microsoft","product":"microsoft sharepoint enterprise server 2016"},{"vendor":"microsoft","product":"microsoft sharepoint server 2019"},{"vendor":"microsoft","product":"microsoft sharepoint server subscription edition"},{"vendor":"microsoft","product":"sharepoint"},{"vendor":"microsoft","product":"sharepoint_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-50522","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50522"},{"url":"https://github.com/advisories/GHSA-ww8x-9jc5-9v7f"}],"sources":{"cve":[{"id":"CVE-2026-50522","title":"Microsoft SharePoint Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:05:27.656Z","modified":"2026-11-10T22:36:02.352Z","cvss":[{"version":"3.1","score":9.8,"vector":"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","level":"critical","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-10T23:49:29.024872Z"}],"euvd":[{"id":"EUVD-2026-43767","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:05:27Z","modified":"2026-11-10T22:36:02Z","cvss":[{"version":"3.1","score":9.8,"vector":"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","level":"critical"}],"exploited_since":"2026-07-22","updated_at":"2026-11-11T00:24:48.910061Z"}],"ghsa":[{"id":"GHSA-ww8x-9jc5-9v7f","title":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker...","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T18:32:05Z","modified":"2026-07-22T21:31:51Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:09:39.885892Z"}],"kev":[{"id":"CVE-2026-50522","title":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability ","description":"Microsoft SharePoint contains a deserialization of untrusted data vulnerability which could allow an unauthorized attacker to execute code over a network.","cwes":["CWE-502"],"kev":{"date_added":"2026-07-22","due_date":"2026-07-25","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-50522","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:17:01.547Z","modified":"2026-07-23T15:44:10.873Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}