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CVE-2026-55040

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:13edc771cfeedaa4d65d2c4ef95dc29c2377ae14e2b1b18e528440821d6e43e3
Known exploited
Not asserted
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":"16.0.10417.20175","status":"affected","version":"16.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/1

{"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:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/2

{"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:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/0

Affected products and versions

3 source assertions
{"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:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/1
{"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:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/2
{"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:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-1390","description":"CWE-1390: Weak Authentication","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"Microsoft SharePoint Server Security Feature Bypass Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:76d3d343a3b5193c4e3abe46e04a0b5537d744ba9d9ff5b4098f0ade1a17852d · sha256:d5a5c2d3242800f1… · /containers/cna/references/0

Attribution and limitations

  • 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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