Exploited vulnerabilities / CVE-2026-76504
Confirmed exploited · privilege escalation · Cisco Catalyst SD-WAN ManagerCVE-2026-76504
Cisco Catalyst SD-WAN Manager privilege escalation, confirmed exploited in the wild.
Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request.
| CISA's name for it | Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability |
|---|---|
| Vendor and product | Cisco · Catalyst SD-WAN Manager |
| Type | privilege escalation · CWE-177 |
| Exploited | Confirmed by CISA listed 30 September 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 3 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
Install the update on every affected system, servers and workstations alike.
Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from.
Review who holds administrative rights, and alert on new ones.
| 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-2026-76504 in short
Is CVE-2026-76504 being exploited?
Yes. CISA added CVE-2026-76504 to its Known Exploited Vulnerabilities catalogue on 30 September 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-76504?
US federal agencies must remediate it by 3 October 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-76504 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 39%, the 98th percentile of every CVE it scores.
How do I fix CVE-2026-76504?
Install the update on every affected system, servers and workstations alike. Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from. Review who holds administrative rights, and alert on new ones.
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-2026-76519 | Secure Email Gateway | path traversal | 14 October 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.