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CVE-2026-55126

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8c9511bf10575a06c59cf785db8158182025a9d89bdacb274720b691e54e0a83
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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"Microsoft SharePoint Server Spoofing Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:12da581339b5982f802536e1b1e81c123cd9b13535363cfe61332067bfca1b13 · sha256:906abfc10ac894c7… · /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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