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Vulnerability

CVE-2026-76504 — Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Exploited in the wild 3 stories · 2 outlets

Official record (cve.org)NVDCVE watch

Impacted if

Cisco Catalyst SD-WAN Manager

CISA Known Exploited Vulnerabilities

Added on 2026-09-30, federal remediation due 2026-10-03. 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.

First seen by AX-NEWS · latest story . Severity: NVD, or the CVE record while the NVD has not scored it. This product uses data from the NVD API but is not endorsed or certified by the NVD.

Coverage

  1. CISA Adds Exploited Cisco Catalyst SD-WAN Manager Auth Bypass to KEV
    INThe Hacker News Cybersecurity

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added a critical authentication bypass flaw impacting Cisco Catalyst SD-WAN Manager to its Known Exploited Vulnerabilities (KEV), following reports of active…

  2. Cisco Warns of Attackers Exploiting Critical Authentication Bypass in SD-WAN Manager
    INThe Hacker News Cybersecurity

    Attackers are exploiting a new critical zero-day flaw in Cisco Catalyst SD-WAN Manager, the system companies use to manage their Cisco SD-WAN networks, Cisco said in an advisory on September 30. The flaw, CVE-2026-76504, could allow a…

  3. Cisco warns of new SD-WAN zero-day exploited in attacks
    USBleepingComputer Cybersecurity

    Cisco released security updates to address a critical zero-day in the Catalyst SD-WAN Manager (tracked as CVE-2026-76504) that attackers are actively exploiting to escalate to admin privileges. [...]