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CVE-2026-76504

Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 30 Sep 2026

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.

Key facts

Published
30 Sep 2026
Last changed
2 Oct 2026
Assigned by
cisco
KEV added
30 Sep 2026
KEV fix due
3 Oct 2026
EPSS
38.928% likely to be exploited in the next 30 days, higher than 98.612% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Catalyst SD-WAN Manager
  • Default status: unknown
  • 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 (affected)
  • 17.2.9 (affected)
  • 18.3.4 (affected)
  • 17.2.5 (affected)
  • 18.3.1.1 (affected)
  • 18.3.5 (affected)
  • 18.4.0.1 (affected)
  • 18.3.3 (affected)
  • 17.2.7 (affected)
  • 17.2.4 (affected)
  • 18.3.0 (affected)
  • 19.2.3 (affected)
  • 18.4.501_ES (affected)
  • 20.3.1 (affected)
  • 20.1.2 (affected)
  • 19.2.929 (affected)
  • 19.2.31 (affected)
  • 20.3.2 (affected)
  • 19.2.32 (affected)
  • 20.3.2_925 (affected)
  • 20.3.2.1 (affected)
  • 20.3.2.1_927 (affected)
  • 18.4.6 (affected)
  • 20.1.2_937 (affected)
  • 20.4.1 (affected)
  • 20.3.2_928 (affected)
  • 20.3.2_929 (affected)
  • 20.4.1.0.1 (affected)
  • 20.3.2.1_930 (affected)
  • 19.2.4 (affected)
  • 20.5.0.1.1 (affected)
  • 20.4.1.1 (affected)
  • 20.3.3 (affected)
  • 19.2.4.0.1 (affected)
  • 20.3.2_937 (affected)
  • 20.3.3.1 (affected)
  • 20.5.1 (affected)
  • 20.1.3 (affected)
  • 20.3.3.0.4 (affected)
  • 20.3.3.1.2 (affected)
  • 20.3.3.1.1 (affected)
  • 20.4.1.2 (affected)
  • 20.3.3.0.2 (affected)
  • 20.4.1.1.5 (affected)
  • 20.4.1.0.01 (affected)
  • 20.4.1.0.02 (affected)
  • 20.3.3.1.7 (affected)
  • 20.3.3.1.5 (affected)
  • 20.5.1.0.1 (affected)
  • 20.3.3.1.10 (affected)
  • 20.3.3.0.8 (affected)
  • 20.4.2 (affected)
  • 20.4.2.0.1 (affected)
  • 20.3.4 (affected)
  • 20.3.3.0.14 (affected)
  • 19.2.4.0.8 (affected)
  • 19.2.4.0.9 (affected)
  • 20.3.4.0.1 (affected)
  • 20.3.2.0.5 (affected)
  • 20.6.1 (affected)
  • 20.5.1.0.2 (affected)
  • 20.3.3.0.17 (affected)
  • 20.6.1.1 (affected)
  • 20.6.0.18.3 (affected)
  • 20.3.2.0.6 (affected)
  • 20.6.0.18.4 (affected)
  • 20.4.2.0.2 (affected)
  • 20.3.3.0.16 (affected)
  • 20.3.4.0.5 (affected)
  • 20.6.1.0.1 (affected)
  • 20.3.4.0.6 (affected)
  • 20.6.2 (affected)
  • 20.7.1EFT2 (affected)
  • 20.3.4.0.9 (affected)
  • 20.3.4.0.11 (affected)
  • 20.4.2.0.4 (affected)
  • 20.3.3.0.18 (affected)
  • 20.7.1 (affected)
  • 20.6.2.1 (affected)
  • 20.3.4.1 (affected)
  • 20.5.1.1 (affected)
  • 20.4.2.1 (affected)
  • 20.4.2.1.1 (affected)
  • 20.3.4.1.1 (affected)
  • 20.3.813 (affected)
  • 20.3.4.0.19 (affected)
  • 20.4.2.2.1 (affected)
  • 20.5.1.2 (affected)
  • 20.3.4.2 (affected)
  • 20.3.814 (affected)
  • 20.4.2.2 (affected)
  • 20.6.2.2 (affected)
  • 20.3.4.2.1 (affected)
  • 20.7.1.1 (affected)
  • 20.3.4.1.2 (affected)
  • 20.6.2.2.2 (affected)
  • 20.3.4.0.20 (affected)
  • 20.6.2.2.3 (affected)
  • 20.4.2.2.2 (affected)
  • 20.3.5 (affected)
  • 20.6.2.0.4 (affected)
  • 20.4.2.2.3 (affected)
  • 20.3.4.0.24 (affected)
  • 20.6.2.2.7 (affected)
  • 20.6.3 (affected)
  • 20.3.4.2.2 (affected)
  • 20.4.2.2.4 (affected)
  • 20.7.1.0.2 (affected)
  • 20.8.1 (affected)
  • 20.3.5.0.8 (affected)
  • 20.3.5.0.9 (affected)
  • 20.4.2.2.8 (affected)
  • 20.3.5.0.7 (affected)
  • 20.6.3.0.7 (affected)
  • 20.6.3.0.5 (affected)
  • 20.6.3.0.10 (affected)
  • 20.6.3.0.2 (affected)
  • 20.7.2 (affected)
  • 20.9.1EFT2 (affected)
  • 20.6.3.0.11 (affected)
  • 20.6.3.1 (affected)
  • 20.6.3.0.14 (affected)
  • 20.6.4 (affected)
  • 20.9.1 (affected)
  • 20.6.3.0.19 (affected)
  • 20.6.3.0.18 (affected)
  • 20.3.6 (affected)
  • 20.9.1.1 (affected)
  • 20.6.3.0.23 (affected)
  • 20.6.4.0.4 (affected)
  • 20.6.3.0.25 (affected)
  • 20.6.5 (affected)
  • 20.6.3.0.27 (affected)
  • 20.9.2 (affected)
  • 20.9.2.1 (affected)
  • 20.6.3.0.29 (affected)
  • 20.6.3.0.31 (affected)
  • 20.6.3.0.32 (affected)
  • 20.10.1 (affected)
  • 20.6.3.0.33 (affected)
  • 20.9.2.0.01 (affected)
  • 20.9.1_LI_Images (affected)
  • 20.10.1_LI_Images (affected)
  • 20.9.2_LI_Images (affected)
  • 20.3.7 (affected)
  • 20.9.3 (affected)
  • 20.6.5.1 (affected)
  • 20.11.1 (affected)
  • 20.11.1_LI_Images (affected)
  • 20.9.3_LI_ Images (affected)
  • 20.6.3.1.1 (affected)
  • 20.9.3.0.2 (affected)
  • 20.6.5.1.2 (affected)
  • 20.9.3.0.3 (affected)
  • 20.4.2.3 (affected)
  • 20.6.3.2 (affected)
  • 20.6.4.1 (affected)
  • 20.6.3.0.38 (affected)
  • 20.6.3.0.39 (affected)
  • 20.3.5.1 (affected)
  • 20.3.4.3 (affected)
  • 20.9.3.1 (affected)
  • 20.3.3.2 (affected)
  • 20.6.5.2 (affected)
  • 20.3.7.1 (affected)
  • 20.10.1.1 (affected)
  • 20.6.5.2.1 (affected)
  • 20.3.4.0.25 (affected)
  • 20.6.2.2.4 (affected)
  • 20.6.1.2 (affected)
  • 20.11.1.1 (affected)
  • 20.9.3.0.5 (affected)
  • 20.3.4.0.26 (affected)
  • 20.6.5.1.3 (affected)
  • 20.6.3.0.40 (affected)
  • 20.1.3.1 (affected)
  • 20.9.2.2 (affected)
  • 20.6.5.2.3 (affected)
  • 20.6.5.1.4 (affected)
  • 20.6.5.3 (affected)
  • 20.6.3.0.41 (affected)
  • 20.9.3.0.7 (affected)
  • 20.6.5.1.5 (affected)
  • 20.9.3.0.4 (affected)
  • 20.6.4.0.19 (affected)
  • 20.6.5.1.6 (affected)
  • 20.9.3.0.8 (affected)
  • 20.6.3.3 (affected)
  • 20.3.7.2 (affected)
  • 20.6.5.4 (affected)
  • 20.6.5.1.7 (affected)
  • 20.9.3.0.12 (affected)
  • 20.6.4.2 (affected)
  • 20.6.5.5 (affected)
  • 20.9.3.2 (affected)
  • 20.11.1.2 (affected)
  • 20.6.3.4 (affected)
  • 20.10.1.2 (affected)
  • 20.6.5.1.9 (affected)
  • 20.9.3.0.16 (affected)
  • 20.6.3.0.45 (affected)
  • 20.6.5.1.10 (affected)
  • 20.9.3.0.17 (affected)
  • 20.6.5.2.4 (affected)
  • 20.6.4.0.21 (affected)
  • 20.9.3.0.18 (affected)
  • 20.6.3.0.46 (affected)
  • 20.6.3.0.47 (affected)
  • 20.9.2.3 (affected)
  • 20.9.3.2_LI_Images (affected)
  • 20.9.3.0.21 (affected)
  • 20.9.3.0.20 (affected)
  • 20.9.4_LI_Images (affected)
  • 20.9.4 (affected)
  • 20.6.5.1.11 (affected)
  • 20.12.1 (affected)
  • 20.12.1_LI_Images (affected)
  • 20.6.5.1.13 (affected)
  • 20.9.3.0.23 (affected)
  • 20.6.5.2.8 (affected)
  • 20.9.4.1 (affected)
  • 20.9.4.1_LI_Images (affected)
  • 20.9.3.0.25 (affected)
  • 20.9.3.0.24 (affected)
  • 20.6.5.1.14 (affected)
  • 20.3.8 (affected)
  • 20.6.6 (affected)
  • 20.9.3.0.26 (affected)
  • 20.6.3.0.51 (affected)
  • 20.9.3.0.29 (affected)
  • 20.12.2 (affected)
  • 20.12.2_LI_Images (affected)
  • 20.6.6.0.1 (affected)
  • 20.13.1_LI_Images (affected)
  • 20.9.4.0.4 (affected)
  • 20.13.1 (affected)
  • 20.9.4.1.1 (affected)
  • 20.9.5 (affected)
  • 20.9.5_LI_Images (affected)
  • 20.12.3_LI_Images (affected)
  • 20.12.3 (affected)
  • 20.9.4.1.3 (affected)
  • 20.6.7 (affected)
  • 20.9.5.1 (affected)
  • 20.9.5.1_LI_Images (affected)
  • 20.9.4.1.6 (affected)
  • 20.14.1 (affected)
  • 20.14.1_LI_Images (affected)
  • 20.9.5.2 (affected)
  • 20.9.5.2.1 (affected)
  • 20.9.5.2_LI_Images (affected)
  • 20.12.3.1 (affected)
  • 20.12.4 (affected)
  • 20.15.1_LI_Images (affected)
  • 20.15.1 (affected)
  • 20.9.5.1.4 (affected)
  • 20.9.5.2.7 (affected)
  • 20.9.5.2.13 (affected)
  • 20.9.6 (affected)
  • 20.9.6_LI_Images (affected)
  • 20.9.5.2.14 (affected)
  • 20.6.8 (affected)
  • 20.12.4.0.03 (affected)
  • 20.16.1 (affected)
  • 20.16.1_LI_Images (affected)
  • 20.12.4_LI_Images (affected)
  • 20.9.5.2.16 (affected)
  • 20.12.4.0.4 (affected)
  • 20.12.401 (affected)
  • 20.9.5.3 (affected)
  • 20.9.5.3_LI_Images (affected)
  • 20.12.4.1_LI_Images (affected)
  • 20.12.4.1 (affected)
  • 20.9.5.2.21 (affected)
  • 20.9.6.0.3 (affected)
  • 20.12.4.0.6 (affected)
  • 20.15.2_LI_Images (affected)
  • 20.15.2 (affected)
  • 20.12.4_Monthly_ES5 (affected)
  • 20.12.5 (affected)
  • 20.12.5_LI_Images (affected)
  • 20.9.7_LI _Images (affected)
  • 20.9.7 (affected)
  • 20.15.3 (affected)
  • 20.15.3_ LI _Images (affected)
  • 20.12.501 (affected)
  • 20.12.5.1_LI_Images (affected)
  • 20.12.5.1 (affected)
  • 20.12.5.2_LI_Images (affected)
  • 20.12.5.2 (affected)
  • 20.15.3.1 (affected)
  • 20.15.4_LI_Images (affected)
  • 20.15.4 (affected)
  • 20.9.7.1_LI _Images (affected)
  • 20.9.7.1 (affected)
  • 20.18.1 (affected)
  • 20.18.1_LI_Images (affected)
  • 20.12.6_LI_Images (affected)
  • 20.12.6 (affected)
  • 20.12.5.1.01 (affected)
  • 26.0.1 (affected)
  • 20.9.8 (affected)
  • 20.9.8_LI_Images (affected)
  • 20.18.2 (affected)
  • 20.15.4.1_LI_Images (affected)
  • 20.15.4.1 (affected)
  • 20.18.2_LI_Images (affected)
  • 26.1.1 (affected)
  • 26.1.1_LI_Images (affected)
  • 20.18.2.1_LI_Images (affected)
  • 20.18.2.1 (affected)
  • 20.15.4.2_LI_Images (affected)
  • 20.15.4.2 (affected)
  • 20.12.6.1 (affected)
  • 20.12.6.1_LI_Images (affected)
  • 20.12.5.3 (affected)
  • 20.12.5.3_LI_Images (affected)
  • 20.9.8.2_LI_Images (affected)
  • 20.9.8.2 (affected)
  • 20.18.3 (affected)
  • 20.18.3_LI_Images (affected)
  • 20.15.5 (affected)
  • 20.15.5_LI_Images (affected)
  • 20.12.7 (affected)
  • 20.12.7_LI_Images (affected)
  • 20.9.9 (affected)
  • 20.9.9_LI_Images (affected)
  • 20.18.2.2 (affected)
  • 20.18.2.2_LI_Images (affected)
  • 20.12.5.4 (affected)
  • 20.12.5.4_LI_ Images (affected)
  • 20.12.7.1_LI_Images (affected)
  • 20.12.6.2_LI_Images (affected)
  • 20.12.7.1 (affected)
  • 20.15.5.1 (affected)
  • 20.15.4.3 (affected)
  • 20.15.4.3_LI_Images (affected)
  • 20.15.5.1_LI_Images (affected)
  • 20.12.6.2 (affected)
  • 20.15.5.2 (affected)
  • 20.15.5.2_LI_Images (affected)
  • 26.1.1.1_LI_Images (affected)
  • 20.15.4.4 (affected)
  • 20.15.4.4_LI_Images (affected)
  • 26.1.1.1 (affected)
  • 20.9.9.1_LI_Images (affected)
  • 20.9.9.1 (affected)
  • 20.18.3.1_LI_Images (affected)
  • 20.18.3.1 (affected)
  • 26.1.1.2 (affected)
  • 26.1.1.2_LI_Images (affected)
  • 20.15.4.5 (affected)
  • 20.15.4.5_LI_Images (affected)
  • 20.15.5.3 (affected)
  • 20.15.5.3_LI_Images (affected)
  • 20.12.7.2_LI_Images (affected)
  • 20.12.7.2 (affected)
  • 20.9.9.2 (affected)
  • 20.9.9.2_LI_Images (affected)
  • 20.15.6 (affected)
  • 20.15.6_LI_Images (affected)
  • 20.18.4_LI_Imagess (affected)
  • 20.18.4 (affected)
  • 20.12.8 (affected)
  • 20.12.8_LI_Images (affected)
  • 20.18.4_LI_Images (affected)
  • 20.12.8.1 (affected)
  • 20.12.8.1_LI_Images (affected)
  • 20.9.10_LI_Images (affected)
  • 20.9.10 (affected)
  • 26.1.2_LI_Images (affected)
  • 26.1.2 (affected)
  • 20.15.6.0.5_PSIRTAUG (affected)
  • 20.18.4.0.5_PSIRTAUG (affected)
  • 20.12.8.1.1 (affected)
  • 20.9.10.0.01 (affected)
  • 26.1.2.0.02 (affected)
  • 26.2.1_LI_Images (affected)
  • 20.18.4.1.01 (affected)
  • 26.1.2.1_LI_Images (affected)
  • 20.15.6.1_LI_Images (affected)
  • 20.18.4.1_LI_Images (affected)
  • 20.9.10.1.01 (affected)
  • 20.15.6.1.01 (affected)
  • 26.1.2.1.01 (affected)
  • 20.12.8.2.01 (affected)

Timeline

  1. 30 Sep 2026 CVE-2026-76504 added to CISA KEV
  2. 30 Sep 2026 Added to the CISA KEV catalogue
  3. 30 Sep 2026 Published

Weakness

References