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CVE-2026-56164

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9131d7f825255b7d576c92f0f8bb49e7131b7f1b7e580cbc923f6dfa1bcfab07
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 Subscription Edition","vendor":"Microsoft","versions":[{"lessThan":"16.0.19725.20434","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/2

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20175","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/1

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5561.1001","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/0

Affected products and versions

3 source assertions
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server Subscription Edition","vendor":"Microsoft","versions":[{"lessThan":"16.0.19725.20434","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/2
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20175","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/1
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5561.1001","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-306"],"dateAdded":"2026-07-14","dueDate":"2026-07-17","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; 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-2026-56164","product":"SharePoint Server","requiredAction":"Apply mitigations in accordance with vendor instru…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:467aa3dd9e8ad4dae67686166ef8c207b3dbb69eb322a341627d54e46e6d012b · sha256:635dff916c4092c0… · /vulnerabilities/19
    Open source location →
{"cwes":["CWE-306"],"dateAdded":"2026-07-14","dueDate":"2026-07-17","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; 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-2026-56164","product":"SharePoint Server","requiredAction":"Apply mitigations in accordance with vendor instru…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:b7a942c2c59c72ebfac30d9220e5a5a77f20a9d5bf51af928ca5173b3fdfd97c · sha256:16acee8334e59e44… · /vulnerabilities/16
    Open source location →

Source references

2 source assertions
{"name":"Microsoft SharePoint Server Elevation of Privilege Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a439712d03e0f0538da9155aa3e0323186dded9eb7f4f0767babd219fee10866 · sha256:dbeab13e97b98c93… · /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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