{"cve":{"cve_id":"CVE-2026-50522","is_kev":true,"kev_date_added":"2026-07-22","kev_vendor_project":"Microsoft","kev_product":"SharePoint","kev_vulnerability_name":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability ","kev_short_description":"Microsoft SharePoint contains a deserialization of untrusted data vulnerability which could allow an unauthorized attacker to execute code over a network.","kev_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.","kev_due_date":"2026-07-25","kev_known_ransomware":false,"kev_notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-50522","kev_cwes":["CWE-502"],"epss_score":0.84606,"epss_percentile":0.99685,"epss_as_of":"2026-08-26","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","published_at":"2026-07-14T17:05:27.656000Z","last_modified_at":"2026-07-23T15:44:10.873000Z","cvss_v3_score":9.8,"cvss_v3_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","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-502"],"nvd_references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":true,"trended_number_one":false,"trending_peak_score":0.6029358666366625,"trending_peak_rank":7,"started_trending_at":"2026-07-28T01:04:53.289797Z","trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-07-14T18:33:20.779180Z","updated_at":"2026-07-28T19:08:35.360895Z"},"effective_severity":"CRITICAL","badges":["kev","news","epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"},{"metric":"E","name":"E","value":"U","value_label":"Unchanged"},{"metric":"RL","name":"RL","value":"O","value_label":"O"},{"metric":"RC","name":"RC","value":"C","value_label":"Changed"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"microsoft-sharepoint-enterprise-server-2016","product_name":"Microsoft SharePoint Enterprise Server 2016","version_start":"16.0.0","version_start_inclusive":true,"version_end":"16.0.5561.1001","version_end_inclusive":false,"cpe23_uri":"cve5:microsoft:microsoft-sharepoint-enterprise-server-2016:16.0.0:16.0.5561.1001"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"microsoft-sharepoint-server-2019","product_name":"Microsoft SharePoint Server 2019","version_start":"16.0.0","version_start_inclusive":true,"version_end":"16.0.10417.20175","version_end_inclusive":false,"cpe23_uri":"cve5:microsoft:microsoft-sharepoint-server-2019:16.0.0:16.0.10417.20175"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"microsoft-sharepoint-server-subscription-edition","product_name":"Microsoft SharePoint Server Subscription Edition","version_start":"16.0.0","version_start_inclusive":true,"version_end":"16.0.19725.20434","version_end_inclusive":false,"cpe23_uri":"cve5:microsoft:microsoft-sharepoint-server-subscription-edition:16.0.0:16.0.19725.20434"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"sharepoint-server","product_name":"sharepoint_server","version_start":null,"version_start_inclusive":null,"version_end":"16.0.19725.20434","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"sharepoint-server","product_name":"sharepoint_server","version_start":"2016","version_start_inclusive":true,"version_end":"2016","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"sharepoint-server","product_name":"sharepoint_server","version_start":"2019","version_start_inclusive":true,"version_end":"2019","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[{"id":732,"source":"BleepingComputer","url":"https://www.bleepingcomputer.com/news/security/critical-sharepoint-rce-flaw-exploited-to-steal-machine-keys/","title":"Critical SharePoint RCE flaw exploited to steal machine keys","summary":"Hackers are actively exploiting the critical CVE-2026-50522 vulnerability in Microsoft SharePoint to steal machine keys and maintain access even after affected servers are patched. [...]","thumbnail_url":null,"author":"Bill Toulas","published_at":"2026-07-21T20:06:55Z","fetched_at":"2026-07-21T20:08:10.398232Z","trending_score":3.976373897177561e-6,"cve_ids":["CVE-2026-50522"]},{"id":726,"source":"The Hacker News","url":"https://thehackernews.com/2026/07/critical-sharepoint-rce-cve-2026-50522.html","title":"Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC","summary":"A third SharePoint Server flaw patched by Microsoft as part of its Patch Tuesday update for July 2026 has come under active exploitation, per watchTowr.\n\nThe vulnerability in question is CVE-2026-50522 (CVSS score: 9.8), a critical deserialization of untrusted data in Microsoft Office SharePoint that could allow an unauthorized attacker to execute code over a network. Microsoft credited DEVCORE","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEiY-8bLYm125By8D7AuLG0iHjE5hB2_ysYdB1WkSc0wxB_virPrL19JZ0Ow8Nzsu0DkoTWboikIsKEyDs9393o1yaFJ0LZMFy64Hzk4XGzOqnpjJMgptlxVsHnmDm6twDSVhCkT1HFTFVmDW2zvlmz3qvQP9vftatDZFCw_GvauRT_2yEF-REvZlXyb_I/s1600/sharepoint.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-07-21T14:57:51Z","fetched_at":"2026-07-21T15:38:10.615917Z","trending_score":3.4073765461780963e-6,"cve_ids":["CVE-2026-50522"]}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-07-14T17:05:27.656000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-14T19:34:20.782817Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-14T19:34:20.782817Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-14T19:34:20.782817Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"first_article","at":"2026-07-21T14:57:51Z","label":"First news coverage","source":"The Hacker News"},{"type":"cisa_reported","at":"2026-07-22T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-07-22T21:46:53.970341Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"started_trending","at":"2026-07-28T01:04:53.289797Z","label":"Started trending","source":null}]}