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Apexward Pulse
Type Vulnerability

Microsoft

Microsoft SharePoint Server Missing Authentication Vulnerability

1 sourceCVE-2026-56164

At a glance

Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal

Actively exploited in the wild — prioritise confirming exposure.

Why Medium

Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Microsoft SharePoint Server, treat it as High.

Briefing

There is no written leader briefing for this story yet. These questions come from the facts we hold.

Questions to ask IT

  • Do we run Microsoft SharePoint Server, and which versions?
  • Is any of it reachable from the internet?
  • Have we checked whether it has already been used against us?
  • If it is not yet patched, what mitigation is in place, and will the fix be done by 20 Nov?

Next steps

  1. Confirm exposure and remediation status for affected products

Summary

  • CVE-2026-56164 has an estimated ~27.3% chance of attack in 30 days (98.1th percentile) as of 2026-11-12 — probability signal, not confirmed exploitation
  • CVE-2026-56164 is confirmed as exploited in the wild (US known-exploited catalogue)
  • Authoritative catalogues report active exploitation of this vulnerability.

Read the original reportFIRST EPSS(opens in a new tab)

Products and services involved

17 reports

Part of Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

All 17 reports in this story

Pulse

Last change 2h ago · Next recheck 13 Nov 2026, 14:08 UK time

  1. Story13 Nov 2026, 08:08 UK time · 2h ago

    Linked reporting from (official standard body).

    Read source (FIRST EPSS)

1 entry so far. The timeline chart appears once this story has more history.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ClaimedHeadline60% confidence

    Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

  • ProbableSummary fact75% confidence

    CVE-2026-56164 has an estimated attack likelihood score of 0.273 (~27.3% estimated chance of exploitation in the next 30 days; 98.1th percentile) as of 2026-11-12. This is a probability signal from FIRST, not confirmed exploitation.

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2026-56164

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2026-56164 is confirmed as exploited in the wild (US known-exploited catalogue)

  • ConfirmedEstimated attack likelihood95% confidence

    CVE-2026-56164 has an estimated ~27.3% chance of attack in 30 days (98.1th percentile) as of 2026-11-12 — probability signal, not confirmed exploitation