CVE-2026-76504Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1cisco (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due 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.
Details
- CVE ID
- CVE-2026-76504
- Status
- Analyzed
- Assigner (CNA)
- cisco
- Published
- Sep 30, 2026
- Last modified
- 2026-10-03 00:16 UTC
- Weaknesses
- CWE-177 · Improper Handling of URL Encoding (Hex Encoding)
Affected Products
As published by the CNA in the CVE record.
CiscoCisco Catalyst SD-WAN Manager415 version ranges
- 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
- 19.2.099
- 18.3.6
- 18.3.7
- 19.2.0
- 18.3.8
- 19.0.0
- 19.1.0
- 18.4.302
- 18.4.303
- 19.2.097
- 19.2.098
- 17.2.10
- 18.3.6.1
- 19.0.1a
- 18.2.0
- 18.4.3
- 18.4.1
- 17.2.8
- 18.3.3.1
- 18.4.0
- 18.3.1
- 17.2.6
- 17.2.9
- 18.3.4
- 17.2.5
- 18.3.1.1
- 18.3.5
- 18.4.0.1
- 18.3.3
- 17.2.7
- 17.2.4
- 18.3.0
- 19.2.3
- 18.4.501_ES
- 20.3.1
- 20.1.2
- 19.2.929
- 19.2.31
- 20.3.2
- 19.2.32
- 20.3.2_925
- 20.3.2.1
- 20.3.2.1_927
- 18.4.6
- 20.1.2_937
- 20.4.1
- 20.3.2_928
- 20.3.2_929
- 20.4.1.0.1
- 20.3.2.1_930
- 19.2.4
- 20.5.0.1.1
- 20.4.1.1
- 20.3.3
- 19.2.4.0.1
- 20.3.2_937
- 20.3.3.1
- 20.5.1
- 20.1.3
- 20.3.3.0.4
- 20.3.3.1.2
- 20.3.3.1.1
- 20.4.1.2
- 20.3.3.0.2
- 20.4.1.1.5
- 20.4.1.0.01
- 20.4.1.0.02
- 20.3.3.1.7
- 20.3.3.1.5
- 20.5.1.0.1
- 20.3.3.1.10
- 20.3.3.0.8
- 20.4.2
- 20.4.2.0.1
- 20.3.4
- 20.3.3.0.14
- 19.2.4.0.8
- 19.2.4.0.9
- 20.3.4.0.1
- 20.3.2.0.5
- 20.6.1
- 20.5.1.0.2
- 20.3.3.0.17
- 20.6.1.1
- 20.6.0.18.3
- 20.3.2.0.6
- 20.6.0.18.4
- 20.4.2.0.2
- 20.3.3.0.16
- 20.3.4.0.5
- 20.6.1.0.1
- 20.3.4.0.6
- 20.6.2
- 20.7.1EFT2
- 20.3.4.0.9
- 20.3.4.0.11
- 20.4.2.0.4
- 20.3.3.0.18
- 20.7.1
- 20.6.2.1
- 20.3.4.1
- 20.5.1.1
- 20.4.2.1
- 20.4.2.1.1
- 20.3.4.1.1
- 20.3.813
- 20.3.4.0.19
- 20.4.2.2.1
- 20.5.1.2
- 20.3.4.2
- 20.3.814
- 20.4.2.2
- 20.6.2.2
- 20.3.4.2.1
- 20.7.1.1
- 20.3.4.1.2
- 20.6.2.2.2
- 20.3.4.0.20
- 20.6.2.2.3
- 20.4.2.2.2
- 20.3.5
- 20.6.2.0.4
- 20.4.2.2.3
- 20.3.4.0.24
- 20.6.2.2.7
- 20.6.3
- 20.3.4.2.2
- 20.4.2.2.4
- 20.7.1.0.2
- 20.8.1
- 20.3.5.0.8
- 20.3.5.0.9
- 20.4.2.2.8
- 20.3.5.0.7
- 20.6.3.0.7
- 20.6.3.0.5
- 20.6.3.0.10
- 20.6.3.0.2
- 20.7.2
- 20.9.1EFT2
- 20.6.3.0.11
- 20.6.3.1
- 20.6.3.0.14
- 20.6.4
- 20.9.1
- 20.6.3.0.19
- 20.6.3.0.18
- 20.3.6
- 20.9.1.1
- 20.6.3.0.23
- 20.6.4.0.4
- 20.6.3.0.25
- 20.6.5
- 20.6.3.0.27
- 20.9.2
- 20.9.2.1
- 20.6.3.0.29
- 20.6.3.0.31
- 20.6.3.0.32
- 20.10.1
- 20.6.3.0.33
- 20.9.2.0.01
- 20.9.1_LI_Images
- 20.10.1_LI_Images
- 20.9.2_LI_Images
- 20.3.7
- 20.9.3
- 20.6.5.1
- 20.11.1
- 20.11.1_LI_Images
- 20.9.3_LI_ Images
- 20.6.3.1.1
- 20.9.3.0.2
- 20.6.5.1.2
- 20.9.3.0.3
- 20.4.2.3
- 20.6.3.2
- 20.6.4.1
- 20.6.3.0.38
- 20.6.3.0.39
- 20.3.5.1
- 20.3.4.3
- 20.9.3.1
- 20.3.3.2
- 20.6.5.2
- 20.3.7.1
- 20.10.1.1
- 20.6.5.2.1
- 20.3.4.0.25
- 20.6.2.2.4
- 20.6.1.2
- 20.11.1.1
- 20.9.3.0.5
- 20.3.4.0.26
- 20.6.5.1.3
- 20.6.3.0.40
- 20.1.3.1
- 20.9.2.2
- 20.6.5.2.3
- 20.6.5.1.4
- 20.6.5.3
- 20.6.3.0.41
- 20.9.3.0.7
- 20.6.5.1.5
- 20.9.3.0.4
- 20.6.4.0.19
- 20.6.5.1.6
- 20.9.3.0.8
- 20.6.3.3
- 20.3.7.2
- 20.6.5.4
- 20.6.5.1.7
- 20.9.3.0.12
- 20.6.4.2
- 20.6.5.5
- 20.9.3.2
- 20.11.1.2
- 20.6.3.4
- 20.10.1.2
- 20.6.5.1.9
- 20.9.3.0.16
- 20.6.3.0.45
- 20.6.5.1.10
- 20.9.3.0.17
- 20.6.5.2.4
- 20.6.4.0.21
- 20.9.3.0.18
- 20.6.3.0.46
- 20.6.3.0.47
- 20.9.2.3
- 20.9.3.2_LI_Images
- 20.9.3.0.21
- 20.9.3.0.20
- 20.9.4_LI_Images
- 20.9.4
- 20.6.5.1.11
- 20.12.1
- 20.12.1_LI_Images
- 20.6.5.1.13
- 20.9.3.0.23
- 20.6.5.2.8
- 20.9.4.1
- 20.9.4.1_LI_Images
- 20.9.3.0.25
- 20.9.3.0.24
- 20.6.5.1.14
- 20.3.8
- 20.6.6
- 20.9.3.0.26
- 20.6.3.0.51
- 20.9.3.0.29
- 20.12.2
- 20.12.2_LI_Images
- 20.6.6.0.1
- 20.13.1_LI_Images
- 20.9.4.0.4
- 20.13.1
- 20.9.4.1.1
- 20.9.5
- 20.9.5_LI_Images
- 20.12.3_LI_Images
- 20.12.3
- 20.9.4.1.3
- 20.6.7
- 20.9.5.1
- 20.9.5.1_LI_Images
- 20.9.4.1.6
- 20.14.1
- 20.14.1_LI_Images
- 20.9.5.2
- 20.9.5.2.1
- 20.9.5.2_LI_Images
- 20.12.3.1
- 20.12.4
- 20.15.1_LI_Images
- 20.15.1
- 20.9.5.1.4
- 20.9.5.2.7
- 20.9.5.2.13
- 20.9.6
- 20.9.6_LI_Images
- 20.9.5.2.14
- 20.6.8
- 20.12.4.0.03
- 20.16.1
- 20.16.1_LI_Images
- 20.12.4_LI_Images
- 20.9.5.2.16
- 20.12.4.0.4
- 20.12.401
- 20.9.5.3
- 20.9.5.3_LI_Images
- 20.12.4.1_LI_Images
- 20.12.4.1
- 20.9.5.2.21
- 20.9.6.0.3
- 20.12.4.0.6
- 20.15.2_LI_Images
- 20.15.2
- 20.12.4_Monthly_ES5
- 20.12.5
- 20.12.5_LI_Images
- 20.9.7_LI _Images
- 20.9.7
- 20.15.3
- 20.15.3_ LI _Images
- 20.12.501
- 20.12.5.1_LI_Images
- 20.12.5.1
- 20.12.5.2_LI_Images
- 20.12.5.2
- 20.15.3.1
- 20.15.4_LI_Images
- 20.15.4
- 20.9.7.1_LI _Images
- 20.9.7.1
- 20.18.1
- 20.18.1_LI_Images
- 20.12.6_LI_Images
- 20.12.6
- 20.12.5.1.01
- 26.0.1
- 20.9.8
- 20.9.8_LI_Images
- 20.18.2
- 20.15.4.1_LI_Images
- 20.15.4.1
- 20.18.2_LI_Images
- 26.1.1
- 26.1.1_LI_Images
- 20.18.2.1_LI_Images
- 20.18.2.1
- 20.15.4.2_LI_Images
- 20.15.4.2
- 20.12.6.1
- 20.12.6.1_LI_Images
- 20.12.5.3
- 20.12.5.3_LI_Images
- 20.9.8.2_LI_Images
- 20.9.8.2
- 20.18.3
- 20.18.3_LI_Images
- 20.15.5
- 20.15.5_LI_Images
- 20.12.7
- 20.12.7_LI_Images
- 20.9.9
- 20.9.9_LI_Images
- 20.18.2.2
- 20.18.2.2_LI_Images
- 20.12.5.4
- 20.12.5.4_LI_ Images
- 20.12.7.1_LI_Images
- 20.12.6.2_LI_Images
- 20.12.7.1
- 20.15.5.1
- 20.15.4.3
- 20.15.4.3_LI_Images
- 20.15.5.1_LI_Images
- 20.12.6.2
- 20.15.5.2
- 20.15.5.2_LI_Images
- 26.1.1.1_LI_Images
- 20.15.4.4
- 20.15.4.4_LI_Images
- 26.1.1.1
- 20.9.9.1_LI_Images
- 20.9.9.1
- 20.18.3.1_LI_Images
- 20.18.3.1
- 26.1.1.2
- 26.1.1.2_LI_Images
- 20.15.4.5
- 20.15.4.5_LI_Images
- 20.15.5.3
- 20.15.5.3_LI_Images
- 20.12.7.2_LI_Images
- 20.12.7.2
- 20.9.9.2
- 20.9.9.2_LI_Images
- 20.15.6
- 20.15.6_LI_Images
- 20.18.4_LI_Imagess
- 20.18.4
- 20.12.8
- 20.12.8_LI_Images
- 20.18.4_LI_Images
- 20.12.8.1
- 20.12.8.1_LI_Images
- 20.9.10_LI_Images
- 20.9.10
- 26.1.2_LI_Images
- 26.1.2
- 20.15.6.0.5_PSIRTAUG
- 20.18.4.0.5_PSIRTAUG
- 20.12.8.1.1
- 20.9.10.0.01
- 26.1.2.0.02
- 26.2.1_LI_Images
- 20.18.4.1.01
- 26.1.2.1_LI_Images
- 20.15.6.1_LI_Images
- 20.18.4.1_LI_Images
- 20.9.10.1.01
- 20.15.6.1.01
- 26.1.2.1.01
- 20.12.8.2.01