October 12, 2026

CVE Watchtower

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CVE-2026-55040NVD

Vulnerability Summary

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.
Severity Level
CRITICAL(9.1)
Published Date
Jul 14, 2026
Last Modified
Aug 19, 2026
PoC
Available(Nuclei)
Exploitation Status
ACTIVE
EPSS Score (30-Day)
50.59%Probability
Root Weakness (CWE)
CWE-1390: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Microsoft Sharepoint Server < 16.0.19725.20434
  • Microsoft Sharepoint Server
Patched Versions
  • Microsoft Sharepoint Server 16.0.19725.20434
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🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References