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CVE-2026-20963

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f2bf74de3da8a7b342e437be6bf91ad1330b5fae29ab7ec1da325e83bcdc619c
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20083","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/1

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5535.1001","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/0

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server Subscription Edition","vendor":"Microsoft","versions":[{"lessThan":"16.0.19127.20442","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/2

Affected products and versions

3 source assertions
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20083","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/1
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5535.1001","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/0
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server Subscription Edition","vendor":"Microsoft","versions":[{"lessThan":"16.0.19127.20442","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/affected/2

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-502"],"dateAdded":"2026-03-18","dueDate":"2026-03-21","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20963","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.","shortDescription":"Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code ove…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:27ae30135dc30e01dc5ec55cb48db44e12a70838afda6472597813bb0419ebea · sha256:635dff916c4092c0… · /vulnerabilities/116
    Open source location →
{"cwes":["CWE-502"],"dateAdded":"2026-03-18","dueDate":"2026-03-21","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20963","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.","shortDescription":"Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code ove…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:98f9a1aadac23555472508127e9dd385eb9c98414f05b9454f9961418b2b00f2 · sha256:16acee8334e59e44… · /vulnerabilities/113
    Open source location →

Source references

2 source assertions
{"name":"Microsoft SharePoint Remote Code Execution Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7dd43442b3a40d70c27c9c498e197b5fe176604faf1e6b8b0035093740ee77de · sha256:cf00488e9b42dbf3… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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