CVE-2026-76442

Cisco Secure Email Gateway Security Hardening Release

Published Sep 14, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Description

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-2026-76442 are related to issues with improper validation of specified quantity in input that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-1284.

Analysis

Technical impact

The vulnerability is caused by a failure to properly validate quantity values supplied in user input on Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The flaw is classified as an input‑validation weakness (CWE‑1284) and could allow an attacker to send or influence quantity parameters that do not conform to expected ranges, potentially causing the software to behave unexpectedly or fail to process requests correctly.

Affected Systems

The affected products are Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. No specific version information is provided in the advisory; all deployed instances of these products are potentially impacted.

Risk and Exploitability

The CVSS score of 7.5 indicates a high severity level. The EPSS score of < 1% means the likelihood of exploitation is very low but not zero. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is through web or service interfaces where quantity parameters are accepted; this inference is drawn from the description that improperly validated quantity values can be supplied by users.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Email

unknown

Version	Status	Constraints
`14.0.0-698`	affected	—
`13.5.1-277`	affected	—
`13.0.0-392`	affected	—
`14.2.0-620`	affected	—
`13.0.5-007`	affected	—
`13.5.4-038`	affected	—
`14.2.1-020`	affected	—
`14.3.0-032`	affected	—
`15.0.0-104`	affected	—
`15.0.1-030`	affected	—
`15.5.0-048`	affected	—
`15.5.1-055`	affected	—
`15.5.2-018`	affected	—
`16.0.0-050`	affected	—
`15.0.3-002`	affected	—
`16.0.0-054`	affected	—
`15.5.3-022`	affected	—
`16.0.1-017`	affected	—
`15.5.4-012`	affected	—
`16.0.4-016`	affected	—
`15.0.5-016`	affected	—
`16.0.2-112`	affected	—
`16.0.3-044`	affected	—
`16.5.0-780`	affected	—

Cisco

Cisco Secure Email and Web Manager

unknown

Version	Status	Constraints
`13.6.2-023`	affected	—
`13.6.2-078`	affected	—
`13.0.0-249`	affected	—
`13.0.0-277`	affected	—
`13.8.1-052`	affected	—
`13.8.1-068`	affected	—
`13.8.1-074`	affected	—
`14.0.0-404`	affected	—
`12.8.1-002`	affected	—
`14.1.0-227`	affected	—
`13.6.1-201`	affected	—
`14.2.0-203`	affected	—
`14.2.0-212`	affected	—
`12.8.1-021`	affected	—
`13.8.1-108`	affected	—
`14.2.0-224`	affected	—
`14.3.0-120`	affected	—
`15.0.0-334`	affected	—
`15.5.1-024`	affected	—
`15.5.1-029`	affected	—
`15.5.2-005`	affected	—
`16.0.0-195`	affected	—
`15.5.3-017`	affected	—
`16.0.1-010`	affected	—
`15.0.1-035`	affected	—
`16.0.2-088`	affected	—
`15.5.4-007`	affected	—
`15.0.2-007`	affected	—
`16.0.4-010`	affected	—
`16.0.3-016`	affected	—
`16.5.0-429`	affected	—

No data.

Vendor Product Versions

Cisco

Secure Email

Version	Status	Scheme	Platform
`14.0.0-698`	affected	semver	—
`13.5.1-277`	affected	semver	—
`13.0.0-392`	affected	semver	—
`14.2.0-620`	affected	semver	—
`13.0.5-007`	affected	semver	—
`13.5.4-038`	affected	semver	—
`14.2.1-020`	affected	semver	—
`14.3.0-032`	affected	semver	—
`15.0.0-104`	affected	semver	—
`15.0.1-030`	affected	semver	—
`15.5.0-048`	affected	semver	—
`15.5.1-055`	affected	semver	—
`15.5.2-018`	affected	semver	—
`16.0.0-050`	affected	semver	—
`15.0.3-002`	affected	semver	—
`16.0.0-054`	affected	semver	—
`15.5.3-022`	affected	semver	—
`16.0.1-017`	affected	semver	—
`15.5.4-012`	affected	semver	—
`16.0.4-016`	affected	semver	—
`15.0.5-016`	affected	semver	—
`16.0.2-112`	affected	semver	—
`16.0.3-044`	affected	semver	—
`16.5.0-780`	affected	semver	—

Cisco

Secure Email And Web Manager

Version	Status	Scheme	Platform
`13.6.2-023`	affected	semver	—
`13.6.2-078`	affected	semver	—
`13.0.0-249`	affected	semver	—
`13.0.0-277`	affected	semver	—
`13.8.1-052`	affected	semver	—
`13.8.1-068`	affected	semver	—
`13.8.1-074`	affected	semver	—
`14.0.0-404`	affected	semver	—
`12.8.1-002`	affected	semver	—
`14.1.0-227`	affected	semver	—
`13.6.1-201`	affected	semver	—
`14.2.0-203`	affected	semver	—
`14.2.0-212`	affected	semver	—
`12.8.1-021`	affected	semver	—
`13.8.1-108`	affected	semver	—
`14.2.0-224`	affected	semver	—
`14.3.0-120`	affected	semver	—
`15.0.0-334`	affected	semver	—
`15.5.1-024`	affected	semver	—
`15.5.1-029`	affected	semver	—
`15.5.2-005`	affected	semver	—
`16.0.0-195`	affected	semver	—
`15.5.3-017`	affected	semver	—
`16.0.1-010`	affected	semver	—
`15.0.1-035`	affected	semver	—
`16.0.2-088`	affected	semver	—
`15.5.4-007`	affected	semver	—
`15.0.2-007`	affected	semver	—
`16.0.4-010`	affected	semver	—
`16.0.3-016`	affected	semver	—
`16.5.0-429`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the Cisco Secure Email and Cisco Secure Email and Web Manager hardening releases as distributed in the Cisco advisory
Follow the installation instructions provided in the Cisco advisory to update the gateway software with the latest hardening patches
Review and enforce input‑validation rules for quantity parameters on the platform to ensure only valid ranges are accepted

Generated by OpenCVE AI on September 21, 2026 at 00:50 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.467% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

History

Sep 17, 2026 9:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco secure Email Cisco secure Email And Web Manager
Vendors & Products		Cisco Cisco secure Email Cisco secure Email And Web Manager

Sep 15, 2026 6:30 PM Added references View changes

Type	Values Removed	Values Added
References		https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Sep 15, 2026 5:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 14, 2026 9:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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-2026-76442 are related to issues with improper validation of specified quantity in input that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-1284.
Title		Cisco Secure Email Gateway Security Hardening Release
Weaknesses		CWE-1284
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`