VulnIntel

CVE-2026-55040

CVSS 9.1 · CRITICAL
Exploited in the wild
Remediation overdue by 35 days
2 public PoCs
Proof-of-concept code linked in references
EPSS p92
Higher than 92% of all CVEs — elevated exploitation risk.
Patch available
Vendor advisory or patch linked

Published 7/14/2026 · updated 8/19/2026 · CWE-1390

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Summary

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.

CVSS 9.1 — CRITICAL

9.1 / 10
  • AV: Network
  • AC: Low complexity
  • PR: No privileges
  • UI: No user interaction
  • S: Scope unchanged
  • C: Confidentiality: High
  • I: Integrity: High
  • A: Availability: None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS exploitation probability

5.5%

Percentile p92 — Higher than 92% of all CVEs — elevated exploitation risk.

Affected products

1 vendor/product entries
  • Microsoft Sharepoint Server< 16.0.19725.20434
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Timeline

  1. Jul 14, 2026 · Disclosed / published in NVD
  2. Aug 18, 2026 · Added to CISA KEV catalog
  3. Aug 19, 2026 · Intel last updated
  4. Aug 21, 2026 · CISA remediation deadline

Intel sources

Which upstream feeds returned data for this CVE, and when they were last fetched.

  • NVD· 36 days ago
  • CVE.org· 36 days ago
  • FIRST EPSS· 36 days ago
  • CISA KEV· 12 days ago
  • OSV· 36 days ago

Listed in CISA KEV

Added 2026-08-18 · Remediation overdue by 35 days.

References

Patches & mitigations1
Proof-of-concept / exploit2
Other1

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