CVE-2026-76504Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability
Updated under an hour ago ()
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It affects Cisco Catalyst SD-WAN Manager and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Sep 30, 2026; federal agencies had to remediate by Oct 3, 2026. Treat that date as your deadline.
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Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-177
- Known exploited
- Added to CISA KEV Sep 30, 2026; federal remediation due Oct 3, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 1.82% (percentile 78)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Oct 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Catalyst SD-WAN Manager cisco:catalyst_sd_wan_manager (from the name) | 20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 20.1.1; 19.3.0; 19.2.2; and 193 more ranges | CNA record |
cisco catalyst_sd-wan_manager cisco:catalyst_sd-wan_manager | before 20.9.10.1; from 20.12 before 20.12.8.2; from 20.15 before 20.15.6.1; from 20.18 before 20.18.4.1; from 26.1 before 26.1.2.1; 26.2 | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuUmitigation, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.