Exploited vulnerabilities / CVE-2026-76519
Confirmed exploited · path traversal · Cisco Secure Email GatewayCVE-2026-76519
Cisco Secure Email Gateway path traversal, confirmed exploited in the wild.
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.
| CISA's name for it | Cisco Secure Email Gateway Relative Path Traversal Vulnerability |
|---|---|
| Vendor and product | Cisco · Secure Email Gateway |
| Type | path traversal · CWE-23 |
| Exploited | Confirmed by CISA listed 14 October 2026 |
| Likelihood | more likely to be exploited than most |
| Deadline | 17 October 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | sec.cloudapps.cisco.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor fix.
Assume files readable through the flaw were read: rotate secrets and keys stored on the system.
Restrict access to the interface until patched.
| 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. |
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Know before someone else finds it
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CVE-2026-76519 in short
Is CVE-2026-76519 being exploited?
Yes. CISA added CVE-2026-76519 to its Known Exploited Vulnerabilities catalogue on 14 October 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-76519?
US federal agencies must remediate it by 17 October 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-76519 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 6.2%, the 93rd percentile of every CVE it scores.
How do I fix CVE-2026-76519?
Apply the vendor fix. Assume files readable through the flaw were read: rotate secrets and keys stored on the system. Restrict access to the interface until patched.
Other Cisco vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-20320 | BroadWorks | exploited vulnerability | 10 November 2026 |
| CVE-2026-76418 | Secure Firewall ASA Software and Cisco Secure FTD Software | denial of service | 29 October 2026 |
| CVE-2026-76504 | Catalyst SD-WAN Manager | privilege escalation | 30 September 2026 |
| CVE-2026-76460 | Identity Services Engine | privilege escalation | 16 September 2026 |
| CVE-2026-76461 | Secure Email Gateway | SQL injection | 14 September 2026 |
| CVE-2026-20079 | Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management | authentication bypass | 9 September 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.