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CVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Cisco · Secure Email Gateway

Listed by CISA as exploited in the wild since 14 Oct 2026. Below: exploitation status, EPSS and every published CVSS, each with its source, then affected versions and references.

Build snapshot collected · KEV catalog 2026.10.21 · EPSS of 21 Oct 2026 · not a live feed: collected once, at build time

Description

as written by CISA (KEV catalog)

Cisco Secure Email Gateway contains a relative path traversal vulnerability that could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

Required action

CISA KEV

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.

Affected products and versions

CVE record · cisco

  • Cisco · Cisco Secure Email

    • affected: 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
    • and 11 more version statements in the record

Status words (affected, unaffected, unknown) and version bounds are copied from the record. An upper bound such as “before 7.1.0” usually marks the first fixed version; confirm in the vendor advisory before planning an upgrade.

References

CISA KEV notes and CVE record

EPSS over the last 30 days

See also: all Cisco entries in KEV · the full KEV catalog

Related entries

Other Cisco entries in KEV

Added in the same week (see the week)

Questions about CVE-2026-76519

Is CVE-2026-76519 being exploited?

Yes, according to CISA. CVE-2026-76519 was added to the Known Exploited Vulnerabilities catalog on 14 Oct 2026, which CISA does only with reliable evidence of exploitation in the wild. The catalog field for ransomware campaign use says "Unknown".

What is the deadline to remediate CVE-2026-76519?

CISA set 17 Oct 2026 as the due date for US Federal Civilian Executive Branch agencies. The date is binding only for those agencies; other organisations can read it as a measure of urgency.

What is the EPSS score of CVE-2026-76519?

1.57%, in the 75th percentile, in the FIRST EPSS model of 21 Oct 2026. It estimates the probability of exploitation activity in the following 30 days. For a CVE already in KEV the score is secondary: exploitation has been observed.

How severe is CVE-2026-76519?

cisco rates it 9.8 CRITICAL (CVSS 3.1). These are the published assessments as of 22 Oct 2026; this site does not rescore.

Which product does CVE-2026-76519 affect?

Cisco Secure Email Gateway, as named in the CISA catalog. The affected versions listed in the CVE record are on this page; the vendor advisory in the references is the authority on fixed versions.

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