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CVE-2026-58644

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:v2:1f05eb02194e3a1e92da06c8598cc7d1c001fe606b47b7988f494f4a835b0eb3
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":"16.0.19725.20384","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/affected/2

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20153","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/affected/1

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5556.1005","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /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":"16.0.19725.20384","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/affected/2
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20153","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/affected/1
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5556.1005","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/affected/0

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:F/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /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:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-502"],"dateAdded":"2026-07-16","dueDate":"2026-07-19","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644 ; 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-2026-58644","product":"SharePoint","requiredAction":"Apply mitigations in accordance with vendor instructions, ensur…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:d29a35c62000f2ab18e5612983cae73b67a326da453ffabdcdd55eb7e291df9b · sha256:635dff916c4092c0… · /vulnerabilities/13
    Open source location →
{"cwes":["CWE-502"],"dateAdded":"2026-07-16","dueDate":"2026-07-19","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644 ; 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-2026-58644","product":"SharePoint","requiredAction":"Apply mitigations in accordance with vendor instructions, ensur…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:9d5c513f9f978f9a151304bdd55b5f81461cf43f43c736c4649c93649d740cfe · sha256:16acee8334e59e44… · /vulnerabilities/10
    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-2026-58644"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b8d3ce352b74ed0f9dc56c4517bb84c0b43eeac85255071d7a46a0b56ebdb5e4 · sha256:5c0fef5124da8374… · /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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