CVE-2026-76504
KEV: known exploited SSVC: activeCisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV entry
Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability — Cisco / Catalyst SD-WAN Manager
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.
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.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-76504
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA / cisco | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Manager | affected: 20.1.12 affected: 19.2.1 affected: 18.4.4 affected: 18.4.5 affected: 20.1.1.1 affected: 20.1.1 affected: 19.3.0 affected: 19.2.2 affected: 19.2.099 affected: 18.3.6 affected: 18.3.7 affected: 19.2.0 affected: 18.3.8 affected: 19.0.0 affected: 19.1.0 affected: 18.4.302 affected: 18.4.303 affected: 19.2.097 affected: 19.2.098 affected: 17.2.10 affected: 18.3.6.1 affected: 19.0.1a affected: 18.2.0 affected: 18.4.3 affected: 18.4.1 affected: 17.2.8 affected: 18.3.3.1 affected: 18.4.0 affected: 18.3.1 affected: 17.2.6 … default: unknown |
NVD CPE (6)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| cisco | catalyst_sd-wan_manager | < 20.9.10.1 | cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* |
| cisco | catalyst_sd-wan_manager | >= 20.12, < 20.12.8.2 | cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* |
| cisco | catalyst_sd-wan_manager | >= 20.15, < 20.15.6.1 | cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* |
| cisco | catalyst_sd-wan_manager | >= 20.18, < 20.18.4.1 | cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* |
| cisco | catalyst_sd-wan_manager | >= 26.1, < 26.1.2.1 | cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* |
| cisco | catalyst_sd-wan_manager | cpe:2.3:a:cisco:catalyst_sd-wan_manager:26.2:*:*:*:*:*:*:* |
Linux distribution status
References (2)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU NVD, CNA MitigationVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504 NVD, ADP CISA-ADP US Government Resourcegovernment-resource