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CVE-2026-76504

Critical9.8CISA KEV — exploited in the wild

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.

CVSS
9.8v3.1
EPSS (exploit probability)
1.8%78th pct
CISA KEV
Listed

EPSS trendFIRST daily scores, last 90 days

FIRST EPSS rose from 1.1% on 2026-10-01 to 1.8% on 2026-10-20, ranging 1.1%–1.8% across 19 daily scores.
2026-10-01 → 2026-10-20 · 19 days · 1.1%–1.8%
Daily values
FIRST EPSS daily scores for this CVE
Score dateEPSSPercentile
2026-10-201.8%78.4%
2026-10-191.8%78.4%
2026-10-181.8%78.4%
2026-10-161.8%78.4%
2026-10-151.8%78.3%
2026-10-141.8%78.3%
2026-10-131.8%78.2%
2026-10-121.8%78.2%
2026-10-111.8%78.1%
2026-10-101.8%78.1%
2026-10-091.8%78.1%
2026-10-081.8%78.1%
2026-10-071.8%78.1%
2026-10-061.8%78.0%
2026-10-051.6%74.6%
2026-10-041.6%74.6%
2026-10-031.6%74.6%
2026-10-021.6%74.6%
2026-10-011.1%64.3%

CISA KEV entrycatalogue 2026.10.20

Date added
2026-09-30
Federal due date
2026-10-03
Known ransomware use
Unknown

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.

Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-10-21 07:34 UTC). The due date applies to US federal agencies under BOD 22-01.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • cisco catalyst sd-wan manager

Coverage1 article

References

Facts sourced from NVD, FIRST EPSS, and CISA KEV. Last synced 2026-10-21 07:34 UTC.

  • CVSS & description: NVD 2.0, fetched 2026-10-21 06:34 UTC
  • EPSS: FIRST EPSS, fetched 2026-10-21 07:34 UTC; score date 2026-10-20
  • KEV: CISA KEV, fetched 2026-10-21 07:34 UTC