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CVE-2026-45659

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8786756f1aa26a6877ab766f1381c61ddf19eb60c410c9d1e3a3d810bf1c3365
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":"16.0.19725.20280","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/2

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5552.1002","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/0

{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20128","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/1

Affected products and versions

3 source assertions
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server Subscription Edition","vendor":"Microsoft","versions":[{"lessThan":"16.0.19725.20280","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/2
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5552.1002","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/0
{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20128","status":"affected","version":"16.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/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:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /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:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-502"],"dateAdded":"2026-07-01","dueDate":"2026-07-04","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 ; 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-2026-45659","product":"SharePoint Server","requiredAction":"Apply mitigations in accordance with vendor instructions…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:e37af9e16bacb4bc308bfb10095aa1bdbc967f3c3786dbedfc6ae0318973d6f2 · sha256:16acee8334e59e44… · /vulnerabilities/26
    Open source location →
{"cwes":["CWE-502"],"dateAdded":"2026-07-01","dueDate":"2026-07-04","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 ; 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-2026-45659","product":"SharePoint Server","requiredAction":"Apply mitigations in accordance with vendor instructions…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:b3e80b5a53c0aea787a81ab78105fbd0be9ec5c62db50c7dd0a591c43c3c2cae · sha256:635dff916c4092c0… · /vulnerabilities/29
    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-2026-45659"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ff43a2288122ddc99410cab18103554529490ab3a108ed2fd2b6cb7f0dd9595a · sha256:ed30586dcf449985… · /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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