CVE-2026-20262mediumunder attackCWE-22

CVE-2026-20262: medium-severity vulnerability in Cisco Catalyst SD-WAN Manager

Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability

Published · Updated

68Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.

ssvc Actcvss 6.5epss 28%
from disclosure to weapon1 days
Published on NVDJun 15
1st PoC+1d
CISA KEVJun 15
exploitation probability
28%top 2% of all CVEs
observed exploitation
yesCISA + VulnCheck
2 public exploit(s)
Action required by CISAfederal deadline: 2026-06-29

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.

In short

A flaw in Cisco Catalyst SD-WAN Manager's file upload feature allows an authenticated attacker to create or overwrite files on the system. An attacker with login credentials could exploit this to compromise the system and potentially gain full control.

Technical detail

Path traversal vulnerability in the web UI's file upload API endpoint that fails to validate user-supplied input. An authenticated attacker can craft a malicious HTTP request to write arbitrary files to the filesystem, potentially enabling privilege escalation to root. Requires valid credentials (minimum low-privileged user account).

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected products
Cisco · Cisco Catalyst SD-WAN Manager
public PoCs found — 2
githubgithub.com/fevar54/CVE-2026-20262-Cisco-Catalyst-SD-WAN-Manager-Arbitrary-File-Write-★ 1githubgithub.com/HORKimhab/CVE-2026-20262★ 0
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Cisco Catalyst SD-WAN Manager

In the same product, most dangerous first.

CVE-2026-20182CRITICALCisco Catalyst SD-WAN Controller Authentication Bypass VulnerabilityEPSS 91.8%KEVCVE-2026-20127CRITICALCisco Catalyst SD-WAN Controller Authentication Bypass VulnerabilityEPSS 88.5%KEVCVE-2026-20133MEDIUMCVE-2026-20133EPSS 31.8%KEVCVE-2026-20245HIGHCisco Catalyst SD-WAN Controller Authenticated Privilege Escalation VulnerabilityEPSS 25.3%KEVCVE-2026-20122MEDIUMCisco Catalyst SD-WAN Manager Arbitrary File Overwrite VulnerabilityEPSS 25.0%KEVCVE-2022-20775HIGHCisco SD-WAN Software Privilege Escalation VulnerabilityEPSS 12.5%KEV
References
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262