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Known Exploited Vulnerability
9.8
CRITICAL CVSS 3.1
CVE-2026-76461
Cisco Secure Email Gateway SQL Injection Vulnerability - [Actively Exploited]
Overview
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.

Details
INFO

Published Date :

Sept. 14, 2026, 5:17 p.m.

Last Modified :

Sept. 15, 2026, 12:47 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Cisco AsyncOS software for Cisco Secure Email Gateway (SEG) contains a SQL injection vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system.

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.

Known Ransomware Campaign Use:

Unknown

Notes :

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX ; 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-2026-76461

Impact
Affected Products

The following products are affected by CVE-2026-76461 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco asyncos
2 Cisco secure_email_gateway
3 Cisco secure_email
4 Cisco secure_email_gateway_virtual_appliance_c100v
5 Cisco secure_email_gateway_virtual_appliance_c300v
6 Cisco secure_email_gateway_virtual_appliance_c600v
7 Cisco secure_email_gateway_c195
8 Cisco secure_email_gateway_c395
9 Cisco secure_email_gateway_c695
: Total Affected Vendor : 1 | Products : 9
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 CRITICAL MITRE-CVE
CVSS 3.1 CRITICAL [email protected]
Solution
Update Cisco AsyncOS Software to patch email parsing vulnerability and prevent command execution.
  • Apply software updates provided by Cisco.
  • Validate email parsing logic for SQL injection vulnerabilities.
  • Restrict email parsing to trusted sources if possible.
  • Monitor system for unauthorized command execution.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-76461.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76461 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-76461 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-76461 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-76461 vulnerability anywhere in the article.

  • Krypt3ia
Weekly ALL-SOURCE Cyber Warfare Intelligence Brief 9.21.26

Reporting period: September 14–21, 2026Assessment cutoff: September 21, 2026Scope: State and state-aligned cyber operations, APT campaigns, technical intelligence, active exploitation, critical-infras ... Read more

Published Date: Sep 21, 2026 (2 weeks ago)
  • The Hacker News
Cisco Warns of New Zero-Day ISE Auth Bypass (CVSS 10.0) Exploited in Active Attacks

Cisco has warned of a fresh maximum-severity security flaw impacting Identity Services Engine (ISE) that has come under active exploitation. The vulnerability, tracked as CVE-2026-76460 (CVSS score: 1 ... Read more

Published Date: Sep 17, 2026 (2 weeks, 4 days ago)
  • TheCyberThrone
Cisco ISE and Secure Email Gateway Enter the KEV Spotlight

The latest Cisco  security disclosures have put two enterprise security products under immediate scrutiny.Cisco Identity Services Engine (ISE) and Cisco Secure Email Gateway are affected by vulnerabil ... Read more

Published Date: Sep 17, 2026 (2 weeks, 4 days ago)
  • security.nl
Cisco waarschuwt voor misbruik van kritiek SQL Injection-lek in Email Gateway

Aanvallers maken actief misbruik van een kritieke SQL Injection-kwetsbaarheid in de Cisco Secure Email Gateway, zo waarschuwt Cisco. Via het beveiligingslek (CVE-2026-76461) kan een aanvaller willekeu ... Read more

Published Date: Sep 15, 2026 (2 weeks, 6 days ago)
  • The Hacker News
Cisco Secure Email Gateway Flaw Exploited in the Wild, Enables Root Command Execution

Cisco has warned that a new critical vulnerability impacting AsyncOS Software for Cisco Secure Email Gateway has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-7646 ... Read more

Published Date: Sep 15, 2026 (2 weeks, 6 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-76461 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Sep. 15, 2026

    Action Type Old Value New Value
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* versions up to (excluding) 15.5.5-014 *cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* versions from (including) 16.0 up to (excluding) 16.0.4-302 *cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* versions from (including) 16.5 up to (excluding) 16.5.0-780 OR cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c100v:-:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c300v:-:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c600v:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:secure_email_gateway_c195:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:secure_email_gateway_c395:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:secure_email_gateway_c695:-:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX Types: Vendor Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76461 Types: US Government Resource
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 15, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-76461', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T19:40:04.523220Z'} {'id': 'CVE-2026-76461', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T00:00:00+00:00'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Sep. 14, 2026

    Action Type Old Value New Value
    Added Date Added 2026-09-14
    Added Due Date 2026-09-14
    Added Required Action 2026-09-14
    Added Vulnerability Name 2026-09-14
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 14, 2026

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76461
    Changed SSVC {'id': 'CVE-2026-76461', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T16:23:02.212719Z'} {'id': 'CVE-2026-76461', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T19:40:04.523220Z'}
  • New CVE Received by [email protected]

    Sep. 14, 2026

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-89
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/76xxx/CVE-2026-76461.json">CVE-2026-76461</a>
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 14, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-76461', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T16:23:02.212719Z'}
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact