{"answers":{"affected":"It affects 1 product.","exploited":"Yes. Attackers have exploited CVE-2026-20963 in the wild since at least 18 Mar 2026.","fix":"No fix has been published for CVE-2026-20963 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 21 Mar 2026.","what":"CVE-2026-20963 is a critical unsafe deserialization vulnerability in Microsoft Sharepoint Server, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-20963 and fix it if it is affected.\n\nWhat it is: CVE-2026-20963 is a critical unsafe deserialization vulnerability in Microsoft Sharepoint Server, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2026-20963 in the wild since at least 18 Mar 2026.\n\nAffected product: Microsoft Sharepoint Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-20963/ (Markdown: https://insights.sbomify.com/CVE-2026-20963/index.md)","id":"CVE-2026-20963","markdown":"https://insights.sbomify.com/CVE-2026-20963/index.md","name":"CVE-2026-20963","record":{"aliases":["GHSA-5vr8-9cf6-r7px"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"SharePoint Server","requires_auth":"none","summary":"An unauthorized attacker can execute arbitrary code remotely via unsafe deserialization in Microsoft SharePoint Server.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"sharepoint_server","vendor":"microsoft"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","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","version":"3.1"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"exploited"},"has_fix":null,"headline":"Microsoft SharePoint Deserialization of Untrusted Data","id":"CVE-2026-20963","indexable":true,"kev":{"dateAdded":"2026-03-18","dueDate":"2026-03-21","knownRansomwareCampaignUse":"Unknown","product":"SharePoint","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","vendorProject":"Microsoft","vulnerabilityName":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"microsoft:sharepoint_server","products":["microsoft:sharepoint_server"],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Windows Admin Center Elevation of Privilege Vulnerability","id":"CVE-2026-20965"},"packages":[],"prev":{"headline":"Dynamic Root of Trust for Measurement (DRTM) Information Disclosure Vulnerability","id":"CVE-2026-20962"},"products":["Microsoft SharePoint Enterprise Server 2016","Microsoft SharePoint Server 2019","Microsoft SharePoint Server Subscription Edition"],"published":"2026-01-13","related":[{"cvss_score":9.8,"headline":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability","id":"CVE-2026-50522","kev_date_added":"2026-07-22","published":"2026-07-14"},{"cvss_score":9.8,"headline":"Microsoft SharePoint Deserialization of Untrusted Data","id":"CVE-2026-58644","kev_date_added":"2026-07-16","published":"2026-07-14"},{"cvss_score":9.8,"headline":"Microsoft SharePoint Deserialization of Untrusted Data","id":"CVE-2025-53770","kev_date_added":"2025-07-20","published":"2025-07-20"},{"cvss_score":9.8,"headline":"Microsoft SharePoint Server Privilege Escalation","id":"CVE-2023-29357","kev_date_added":"2024-01-10","published":"2023-06-13"},{"cvss_score":9.1,"headline":"Microsoft SharePoint Weak Authentication","id":"CVE-2026-55040","kev_date_added":"2026-08-18","published":"2026-07-14"},{"cvss_score":8.8,"headline":"Microsoft SharePoint Code Injection","id":"CVE-2026-65660","kev_date_added":"2026-09-25","published":"2026-08-11"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-30","vendors":["Microsoft"]},"summary":"An unauthorized attacker can execute arbitrary code remotely via unsafe deserialization in Microsoft SharePoint Server.","url":"https://insights.sbomify.com/CVE-2026-20963/"}