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Response snapshot Oct 26, 2026, 18:57 UTC

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VulnerabilityCVE-2026-76519Known exploitation

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
9.8 Critical (CVSS 3.1)
Chance of exploitation
2.2% in the next 30 days
CISA federal deadline
Oct 17, 2026: passed
Sources
3 independent sources

What to do

Check the vendor advisory for affected versions and fixes.

CISA's 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.

Read NVD CVE-2026-76519 (opens a new tab)

What happened

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

9.8

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

2.2%

Scored Percentile 82.0%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-76519 (opens a new tab)

    NVD record: description, CVSS, affected products, and a CISA SSVC assessment reporting active exploitation.

    Published Checked

  2. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    CISA KEV entry CVE-2026-76519 (opens a new tab)

    The CVE-2026-76519 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  5. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-76519, scored 2026-10-25. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 15). Cisco Secure Email Gateway Relative Path Traversal Vulnerability (CVE-2026-76519). https://kevwire.com/record/CVE-2026-76519

MLA

"Cisco Secure Email Gateway Relative Path Traversal Vulnerability (CVE-2026-76519)." KEVWire, 15 Oct. 2026, kevwire.com/record/CVE-2026-76519.

Chicago

KEVWire. "Cisco Secure Email Gateway Relative Path Traversal Vulnerability (CVE-2026-76519)." Last modified October 15, 2026. https://kevwire.com/record/CVE-2026-76519.

Evidence summary (plain text)

Cisco Secure Email Gateway Relative Path Traversal Vulnerability (Oct 14, 2026).
A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.
CVSS 9.8 (version 3.1; evidence as of Oct 15, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-76519).
EPSS 2.2% for the following 30 days, scored Oct 25, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-76519&date=2026-10-25).
Sources:
NVD CVE-2026-76519: https://nvd.nist.gov/vuln/detail/CVE-2026-76519
Vendor advisory (via NVD references): https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?pubStartDate=2026-10-12T13:35:55.142Z&pubEndDate=2026-10-26T13:35:55.142Z&resultsPerPage=500&startIndex=3000
CISA KEV entry CVE-2026-76519: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-76519&date=2026-10-25
Record ID: CVE-2026-76519.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Oct 17, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 13:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Analyzed. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail