Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-76504

CVE-2026-76504CRITICAL

Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .0158   74.6   YES

AFFECTED
  Product                        Versions   Fixed
  Cisco Catalyst SD-WAN Manager  20.1.12 –  —

TIMELINE
  Aug 19  Reserved by cisco
  Sep 30  ADDED TO KEV — CVE-2026-76504 (Cisco Catalyst SD-WAN Manager). Remediation due October 3, 2026.
  Sep 30  Published (CNA: cisco)

CWE-177 · CNA: cisco · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due October 3, 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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 19, 2026	Reserved	Reserved by cisco
September 30, 2026	KEV ADDED	ADDED TO KEV — CVE-2026-76504 (Cisco Catalyst SD-WAN Manager). Remediation due October 3, 2026.
September 30, 2026	Published	Published (CNA: cisco)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cisco	Cisco Catalyst SD-WAN Manager	—	20.1.12	—

Weaknesses

CWE-177

References (2)

Authoritative record: CVE-2026-76504 at cve.org

Vendors: cisco

Weaknesses: CWE-177

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-76504 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.