CVE-2026-76504 Details
Description
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504 | CISA-ADP | US Government Resource |
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU | [email protected] | MitigationVendor Advisory |
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name | Date Added | Due Date | Required Action |
|---|---|---|---|
| Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability | Sep 30, 2026 | Oct 3, 2026 | 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. |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-177 | Improper Handling of URL Encoding (Hex Encoding) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cisco catalyst sd-wan manager | < 20.9.10.1 >= 20.12, < 20.12.8.2 >= 20.15, < 20.15.6.1 >= 20.18, < 20.18.4.1 >= 26.1, < 26.1.2.1 26.2 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 1, 2026 | CVE Modified | CISA-ADP |
| Sep 30, 2026 | Initial Analysis | [email protected] |
| Sep 30, 2026 | CVE CISA KEV Update | Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government |
| Sep 30, 2026 | CVE Modified | CISA-ADP |
| Sep 30, 2026 | New CVE Received | [email protected] |