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9.1
CRITICAL • CVSS 3.1

CVE-2026-55040

CISA KNOWN EXPLOITED

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

Prioritization

NVD CVSS
9.1
Published
Jul 14, 2026 2:18 PM EDT
Modified
Aug 19, 2026 12:17 AM EDT
CISA KEV
Yes
KEV due date
2026-08-21
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

  1. Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
  2. Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
  3. Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
  4. Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
  5. Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.
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