CVE-2026-76504 Cisco Catalyst SD-WAN Manager - Authentication Bypass

Cisco Catalyst SD-WAN Manager contains an authentication bypass caused by improper URI encoding handling in HTTP requests, letting unauthenticated remote attackers gain admin privileges, exploit requires crafted HTTP request.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
EPSS
1.82% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-177

Vendor fix

Update to the latest available version with the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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