■ Executive Risk Command Center
EPSS Score
4.0%
90th percentile
CISA KEV
LISTED
Remediation due 2026-08-21
Exploitation confirmed? — YES — CISA KEV listed
Urgent remediation? — YES — follow the cited CISA/vendor action
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
⚡ CYBERDUDEBIVASH® SENTINEL APEX
Source-linked automated security intelligence with explicit evidence status and provenance.
🚨 CISA FEDERAL MANDATE — ACTIVE EXPLOITATION CONFIRMED
This vulnerability is actively exploited in the wild. Federal agencies face a legal remediation deadline. Enterprise organizations should treat this with equivalent urgency. CYBERDUDEBIVASH® provides rapid vulnerability assessment and remediation guidance.
🔍 CVE-2026-55040 | 📅 August 18, 2026 | 📂 CISA KEV | 🛡 CYBERDUDEBIVASH®
CISA KEV ALERT · UNRATED
CDB-CTI-2026-0E8C6A083069 · Generated 2026-08-18T18:26:24.498687Z
Executive Summary
Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network. CISA has added CVE-2026-55040 (Microsoft SharePoint) to the Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies required to remediate by 2026-08-21. 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.
Decision: Validate relevance and exposure using the cited source and internal evidence before treating this record as an incident, confirmed compromise, or customer-specific finding.
Threat Classification and Evidence Status
Intelligence family
CISA KEV Alert
Technical severity
UNRATED
Exploitation
Confirmed — CISA KEV listed
Patch/remediation
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.
Verified Facts
Source type: CISA KEV Alert
Source publication time: 2026-08-18T00:00:00+00:00
CVE: CVE-2026-55040
Affected product: SharePoint
EPSS: 3.971%; percentile 89.6%
Exploitation evidence: CISA KEV listed on 2026-08-18; federal due date 2026-08-21
Technical Analysis
Vulnerability class: Unclassified. Assessment: Active exploitation is confirmed by the cited evidence; prioritize exposure confirmation and the authoritative remediation action.
Exposure and Remediation Decisions
P0 — Inventory: Confirm the affected product and version against authoritative vendor/NVD data; prioritize internet-facing and business-critical assets.
P0 — Remediation: 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.
P1 — Compensating controls: Restrict exposure, enforce least privilege, and apply vendor-supported mitigations when immediate remediation is not possible.
P1 — Retrospective review: Search only the telemetry relevant to the affected component and validated vulnerability class; absence of alerts does not prove absence of exploitation.
Source Evidence Extract
CVE ID: CVE-2026-55040
Vendor/Product: Microsoft — SharePoint
Vulnerability Name: Microsoft SharePoint Weak Authentication Vulnerability
Date Added to KEV: 2026-08-18
Federal Remediation Deadline: 2026-08-21
Description: Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.
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.
CISA Notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-55040
This extract is escaped and rendered from the ingested source record; generated analysis is not presented as a source fact.
Detection Engineering
DETECTION STATUS: WITHHELD_INSUFFICIENT_EVIDENCE
The source record does not contain enough product-specific telemetry or observables for a defensible rule.
Confirm affected assets and versions, then collect the product's application, authentication, process, and network telemetry.
Use vendor-provided exploit indicators or a validated reproduction before publishing threat-specific detection logic.
Automated intelligence synthesis — not human reviewed. Public reference draft — not a certified customer deliverable. Customer-specific action requires exposure validation and accountable human approval.
Role-Based Decisions
Vulnerability Manager: Track against cisa kev alert intake. Exploitation status: Confirmed — CISA KEV listed. Patch status: 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.. — Prioritization reflects this record's own exploitation/patch evidence, not a fixed severity template.
SOC Manager: Review the detection guidance below before enabling any blocking action on it. — Detection maturity for this record is stated explicitly, not assumed production-ready.
Source Reliability & Corroboration
cisa_kev
Source Reliability: B
Information Credibility: 3 (Possibly True)
Overall Analytical Confidence: MEDIUM
Reported by a single identified source; an independent second source has not been found (see the evidence ledger).
🎯 Recommended For This Threat
Vulnerability AssessmentAPI · SaaS · Cloud · Web Security
Detection EngineeringVersioned Sigma · YARA · SIEM Content
DevSecOps OptimizationCI/CD Security · Pipeline Hardening
🔗 Related Intelligence Reports
#CyberSecurity #ThreatIntelligence #CyberDudeBivash #SentinelAPEX #CloudSecurity #ZeroTrust #CISAKEV #PatchNow
Provenance and Review Status
Report IDCDB-CTI-2026-0E8C6A083069
Source systemcisa_kev
Source published2026-08-18T00:00:00+00:00
Source-record SHA-2560e8c6a0830695100f8b4fabec77ac0782c5c7b61514771a6b53b6a731073cf29
Generated UTC2026-08-18T18:26:24.512525Z
Review statusAutomated intelligence synthesis — not human reviewed
CertificationPublic Intelligence Certification: TACTICAL_READY (automated evidence-graph certification — see Provenance for the source basis)