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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since yesterday.

No EPSS score available.

Exploitation active

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Catalyst SD-WAN Manager unknown
Version Status Constraints
18.3.6 affected —
18.3.7 affected —
18.3.8 affected —
17.2.10 affected —
18.3.6.1 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 —

Configuration 1 [-]

OR cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:26.2:*:*:*:*:*:*:*

No data.

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Vendors Products
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Catalyst Sd-wan Manager Subscribe

Project Subscriptions

Vendors Products
Cisco Subscribe
Catalyst Sd-wan Manager Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504 cve-icon cve-icon
History

Wed, 30 Sep 2026 22:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:26.2:*:*:*:*:*:*:*

Wed, 30 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco catalyst Sd-wan Manager
Vendors & Products Cisco
Cisco catalyst Sd-wan Manager

Wed, 30 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 30 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-09-30T00:00:00+00:00', 'dueDate': '2026-10-03T00:00:00+00:00'}

Wed, 30 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability
Weaknesses CWE-177
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-09-30T19:58:23.436Z

Reserved: 2026-08-19T12:02:03.641Z

Link: CVE-2026-76504

cve-icon Vulnrichment

Updated: 2026-09-30T13:39:20.192Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-30T13:17:20.247

Modified: 2026-09-30T22:28:51.913

Link: CVE-2026-76504

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T20:30:18Z

Weaknesses