---
title: "CVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-20262/
description: "CVE-2026-20262 (Cisco Catalyst SD-WAN Manager): Exploited in the wild (CISA KEV). A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-15
date_modified: 2026-06-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-20262"
kev: true
cvss: 6.5
epss: 0.28171
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Cisco Catalyst SD-WAN Manager. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-15, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-29 ; treat that as the outer limit, not the target.
- EPSS 28.2% , percentile 98: FIRST’s model estimates a 28.2% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## What it is

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.

## Affected products (CVE record)

- Cisco Cisco Catalyst SD-WAN Manager: 20.1.12, 19.2.1, 18.4.4, 18.4.5, 20.1.1.1, 20.1.1, 19.3.0, 19.2.2, 19.2.099, 18.3.6, 18.3.7, 19.2.0

## Severity

- cisco CVSS 3.1: 6.5 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`

## Exploitation

- CISA KEV: added 2026-06-15; federal due date 2026-06-29. Known ransomware use: Unknown.
- CISA 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 SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 28.17% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (sec.cloudapps.cisco.com)](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ)
- [CVE.org record CVE-2026-20262](https://www.cve.org/CVERecord?id=CVE-2026-20262)
- [NVD entry CVE-2026-20262](https://nvd.nist.gov/vuln/detail/CVE-2026-20262)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

---
Source page: https://erroneo.us/security/cve/CVE-2026-20262/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt