fevar54/cve-2026-76461-detection-kit-Defensive detection kit for CVE-2026-76461, a critical SQL injection in Cisco Secure Email Gateway, with Sigma and YARA rules, IOCs, and remediation guidance.
Detection, hunting, and remediation resources for CVE-2026-76461, a critical SQL injection vulnerability in Cisco AsyncOS for Cisco Secure Email Gateway (SEG).
This repository contains defensive content only: Sigma rules, YARA rules, technical analysis, indicators of compromise, and remediation guidance.
It does NOT contain exploit code, PoC, or weaponized tooling.
The vulnerability has been added to CISA's Known Exploited Vulnerabilities (KEV) catalog. At the time of publication, no public functional PoC exists. Use these resources only in authorized environments.
| Field | Value |
|---|
| CVE | CVE-2026-76461 |
| Vendor | Cisco Systems, Inc. |
| Product | Cisco Secure Email Gateway (AsyncOS) |
| CWE | CWE-89 (SQL Injection) |
| CVSS v3.1 | 9.8 CRITICAL |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Network (crafted email) |
| Impact | Remote code execution as root |
| KEV Added | 2026-09-14 |
| KEV Due Date | 2026-09-17 |
| Public PoC | ❌ None available |
sigma/ — Sigma detection rules for mail logs, web access, and post-exploitationyara/ — YARA rules for scanning mail artifacts and dropped filesdocs/technical-analysis.md — Technical breakdown from public sourcesdocs/iocs.md — Indicators of Compromise (Cisco-official + derived)docs/remediation.md — Fixed versions and upgrade stepspip install sigma-cli
sigma convert -t splunk sigma/cisco_esa_sqli_mail_logs.yml
sigma convert -t elasticsearch sigma/cisco_esa_sqli_mail_logs.yml