CVE-2026-20262
MediumExploitedPublic exploitA 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.
Published Jun 15, 2026 · Updated Jul 24, 2026 · Also known as TR-26-0390
Key Facts
Patch immediately- CVE-2026-20262 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting Catalyst SD-WAN Manager (Cisco).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 15, 2026. Public exploit code is available.
- EPSS estimates a 28% probability of exploitation in the next 30 days.
- Fixed versions are available, including Catalyst SD-WAN Manager 20.12.7.2, Catalyst SD-WAN Manager 20.15.4.5, Catalyst SD-WAN Manager 20.15.5.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS (30-day exploit likelihood)
28%
Higher than 98.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-20262 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 15, 2026 | Jun 29, 2026 | Not reported |
| Industry KEV feed | Jun 15, 2026 | Jun 29, 2026 | Not reported |
| CIRCL KEV | Jun 15, 2026 | Jun 29, 2026 | Not reported |
| ENISA EUVD | Jun 15, 2026 | n/a | Not reported |
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Catalyst SD-WAN ManagerCisco | >= 20.1.12 | 20.9.9.2 |
Patched Releases
Catalyst SD-WAN Manager
20.12.7.2, 20.15.4.5, 20.15.5.3, 20.18.3.1, 20.9.9.2, 26.1.1.2
Timeline
Publicly disclosed
Jun 15, 2026
Added to CISA KEV
Jun 15, 2026
Added to Industry KEV feed
Jun 15, 2026
Added to CIRCL KEV
Jun 15, 2026
Added to ENISA EUVD
Jun 15, 2026
Last updated
Jul 24, 2026
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-20262
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Catalyst SD-WAN Manager (Cisco) versions >= 20.1.12. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 15, 2026.
Yes. It was added on Jun 15, 2026 with a federal remediation due date of Jun 29, 2026.
Public exploit code is available.
Fixed versions are available, including Catalyst SD-WAN Manager 20.12.7.2, Catalyst SD-WAN Manager 20.15.4.5, Catalyst SD-WAN Manager 20.15.5.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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