Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-76519

Cisco Secure Email Gateway Arbitrary File Write Vulnerability

Cisco Secure Email · 14.0.0-698

Watch CVE-2026-76519 Browse KEV feed
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
—
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-76519 is an unauthenticated Cisco Secure Email Gateway Arbitrary File Write Vulnerability. A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Cisco Secure Email 14.0.0-698.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco Secure Email Gateway Arbitrary File Write 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. 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.

Cisco Affected
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
Published
14 Oct 2026
Exploitation Reported
14 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge cisa

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-76519
  • cisco-sa-esa-afw-zqYJkjxp sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Cisco PSIRT CSAF

Recorded 14 Oct 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
Cisco PSIRT CSAF First 2026-10-14 16:46 UTC
The Hacker News 2026-10-14 19:30 UTC
CISA 2026-10-14 19:31 UTC
Security Affairs 2026-10-15 10:22 UTC
SOCRadar 2026-10-15 13:20 UTC
Qualys ThreatPROTECT 2026-10-15 14:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

—

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Relative Path Traversal CWE-23

Recent mention · Qualys ThreatPROTECT

CISA Warns of Cisco Secure Email Gateway Arbitrary File Write Vulnerability (CVE-2026-76519)

Cisco released a security advisory for a critical-severity vulnerability in the Cisco Secure Email Gateway. Tracked as CVE-2026-76519, the vulnerability may allow an attacker to write arbitrary files and execute commands with root privileges on the underlying operating system....

Read full advisory

All Mentions

Recent mention · Qualys ThreatPROTECT

CISA Warns of Cisco Secure Email Gateway Arbitrary File Write Vulnerability (CVE-2026-76519)

Qualys ThreatPROTECT · 15 Oct 2026

Cisco released a security advisory for a critical-severity vulnerability in the Cisco Secure Email Gateway. Tracked as CVE-2026-76519, the vulnerability may allow an attacker to write arbitrary files and execute commands with root privileges on the underlying operating system. CISA acknowledged the active exploitation of the vulnerability by adding it to its Known Exploited Vulnerabilities … Continue reading "CISA Warns of Cisco Secure Email Gateway Arbitrary File Write Vulnerability (CVE-2026-76519)"

Recent mention · SOCRadar

Cisco Secure Email & PAN-OS Zero-Days Exploited

SOCRadar · 15 Oct 2026

Cisco Secure Email & PAN-OS Zero-Days Exploited Cisco and Palo Alto Networks have patched two actively exploited zero-day vulnerabilities that can lead to root-level code execution on security appliances. CISA has flagge

Recent mention · Security Affairs

Cisco Urges Customers to Patch Email Gateway Flaw and Check for Compromise

Security Affairs · 15 Oct 2026

Attackers exploit a critical Cisco email gateway flaw to gain root access. Cisco urges customers to update scanner tools and check for compromise. Cisco confirmed this week that threat actors are exploiting a critical vulnerability in Cisco Secure Email Gateway, tracked as CVE-2026-76519 with a CVSS score of 9.8. An attacker can exploit the flaw […]

Recent mention · The Hacker News

Palo Alto Networks Patches PAN-OS Authenticated RCE Flaw Amid Active Exploitation

The Hacker News · 15 Oct 2026

Ravie LakshmananOct 15, 2026Vulnerability / Network Security Palo Alto Networks on Wednesday issued security updates for a high-severity flaw in PAN-OS software that has come under active exploitation. The vulnerability, tracked as CVE-2026-0322 (CVSS score: 8.6), is a case of remote code execution in the management interface. "A remote code execution (RCE) vulnerability in the management interface of Palo Alto Networks PAN-OS software enables an authenticated attacker with network access to execute arbitrary code with root privileges on the firewall," Palo Alto Networks said. The issue...

Recent mention · Cisco PSIRT CSAF

Cisco Secure Email Gateway Arbitrary File Write Vulnerability

Cisco PSIRT CSAF · 14 Oct 2026

CVE-2026-76519 1.0.0 Initial public release. Summary 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...

Recent mention · The Hacker News

Cisco Warns of Active Attacks Exploiting New Critical Secure Email Gateway Vulnerability

The Hacker News · 14 Oct 2026

Swati KhandelwalOct 14, 2026Email Security / Vulnerability Attackers are exploiting a critical flaw in Cisco Secure Email Gateway that lets a sender with no login write files to the appliance's operating system, Cisco said in an advisory on Wednesday. The attacker sends an email with a crafted attachment through the gateway and, if it succeeds, could then run commands as root. The appliance filters an organization's email for spam, malware, and other threats, and only a gateway with the File Reputation service enabled and a Content Scanner Tools package older than version 25.3.0.5525 is...

Timeline

From disclosure to observed exploitation

  1. 14:20 UTC

    KEV confirmed by Qualys ThreatPROTECT

    Exploitation attested by an external source

  2. 13:20 UTC

    KEV confirmed by SOCRadar

    Exploitation attested by an external source

  3. 10:22 UTC

    KEV confirmed by Security Affairs

    Exploitation attested by an external source

  4. 19:31 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  5. 19:30 UTC

    KEV confirmed by The Hacker News

    Exploitation attested by an external source

  6. 16:46 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  7. 16:07 UTC

    CVE published

    Vulnerability disclosed publicly

  8. 12:02 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

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GET /api/v2/pro/kevs/CVE-2026-76519

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-76519",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}