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CVE-2026-76519 Cisco CVE debrief

Cisco Secure Email Gateway Relative Path Traversal Vulnerability debrief. The vulnerability allows attackers to traverse directories, potentially leading to unauthorized access and data breaches. Defenders should assess exposure and prioritize patching to mitigate risks associated with this vulnerability. Cisco Secure Email Gateway systems are affected, and the vulnerability has been cataloged in the CISA Known Exploited Vulnerabilities catalog. The CVE record was published on 2026-10-14T00:00:00.000Z and has not been modified since then.

Vendor
Cisco
Product
Secure Email Gateway
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders of Cisco Secure Email Gateway systems, security teams, and IT personnel responsible for vulnerability management should assess exposure and prioritize patching. Additionally, operators and administrators of affected systems should evaluate and mitigate according to vendor instructions and ensure compliance with CISA's BOD 26-04 guidance. This vulnerability may impact organizations that rely on Cisco Secure

Why it matters

Defenders should care due to potential path traversal risks and the need for mitigation and compliance with CISA guidance

  • Potential directory traversal risks require verification
  • Need to evaluate and mitigate according to vendor instructions
  • Compliance with CISA’s BOD 26-04 guidance is necessary

Technical summary

Cisco Secure Email Gateway Relative Path Traversal Vulnerability allows attackers to traverse directories, potentially leading to unauthorized access and data breaches. The vulnerability has been identified in the Cisco Secure Email Gateway, a product used for email security. The vulnerability's technical details indicate that it could allow attackers to access sensitive information or execute malicious actions. Defenders should review and apply mitigations in accordance with Cisco instructions to address this vulnerability.

Defensive priority

High priority for defenders due to potential path traversal risks

Recommended defensive actions

  • Review and apply mitigations in accordance with Cisco instructions
  • Ensure compliance with CISA’s BOD 26-04 guidance
  • Evaluate asset internet exposure and adhere to BOD 26-04 patching guidelines

Evidence notes

Evidence from CISA Known Exploited Vulnerabilities catalog and Cisco indicates potential risks associated with Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Sources and references

Verified primary and authoritative sources

  • CVE-2026-76519 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-76519

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-76519 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-76519

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.