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CVE-2026-76441

CRITICAL(9.8)

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

Risk Signal Score30/100 — MITTEL
  • CVSS 9.8 — Kritisch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.5%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

9.8

Technische Schwere

Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76441 are related to issues with improper access control that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.

Erkennung & Indikatoren

Ausnutzung

In den geprüften Quellen nicht genannt

Threat-Hunting-Queries

Detection for improper access control vulnerabilities often requires monitoring for unusual or unauthorized access patterns, failed authentication attempts, or privilege escalation behaviors. Specific queries depend heavily on the application's logging capabilities and normal operational baseline.

Sentinel/Defender KQL

// Monitor for failed authentication attempts or unauthorized access to sensitive resources
SecurityEvent
| where EventID in (4625, 4673) // 4625: An account failed to log on, 4673: A privileged service was called
| where SubjectUserName !contains "$" // Exclude machine accounts for initial broad search
| summarize count() by SubjectUserName, IpAddress, Activity
| order by count_ desc

Splunk SPL

// Monitor for failed authentication attempts or unauthorized access to sensitive resources
index=* (sourcetype=cisco:esa OR sourcetype=cisco:emailmanager) (status=failed OR status=unauthorized)
| stats count by user, src_ip, action
| sort -count

Sigma

title: Cisco Secure Email Gateway - Improper Access Control Attempt
id: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
status: experimental
description: Detects potential attempts to exploit improper access control vulnerabilities in Cisco Secure Email Gateway or Secure Email and Web Manager.
references:
  - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm
logsource:
  product: cisco
  service: email_gateway
detection:
  selection:
    event_type: (authentication_failure OR authorization_failure OR access_denied)
    severity: (high OR critical)
  condition: selection
level: high

Elastic ES|QL

// Monitor for failed authentication attempts or unauthorized access to sensitive resources
FROM logs-cisco.email_gateway-*
| WHERE event.category == "authentication" AND event.outcome == "failure"
  OR event.category == "authorization" AND event.outcome == "failure"
  OR event.action == "access_denied"
| STATS count() BY user.name, source.ip, event.action
| ORDER BY count DESC

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Referenzen