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CVE-2026-20262

MEDIUM KEV CISA Exploitation: ACTIVE
6.5
CVSS 3.1
Description
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.

Metadata

CVE ID
CVE-2026-20262
State
PUBLISHED
Assigner
cisco
Reserved
2025-10-08 11:59 UTC
Published
2026-06-15 16:21 UTC
Last updated
2026-06-15 19:58 UTC
Primary CWE
CWE-22
Improper Limitation of a Pathname to a Restricted Directory …
Vendor / Product
Cisco / Cisco Catalyst SD-WAN Manager
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
SSVC — CISA Coordinator
Exploitation
ACTIVE
Automatable
no
Tech. Impact
partial
CISA Known Exploited Vulnerability
Vulnerability name
Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability
Vendor
Cisco
Product
Catalyst SD-WAN Manager
Added to KEV
2026-06-15
Due date
2026-06-29
Ransomware
Not known
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.
CISA description
Cisco Catalyst SD-WAN Manager contains a directory or path traversal vulnerability that could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system.
Affected products (1)
VendorProductPlatformVersions
Cisco Cisco Catalyst SD-WAN Manager — 20.1.12, 19.2.1, 18.4.4, 18.4.5 …
Weakness (CWE)
CWESourceDescription
CWE-22 cna Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
References (1)
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