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Known exploited vulnerability

CVE-2026-20262

mediumCVSS 3.1 6.5In CISA KEVEPSS 29%Published · Cisco

The short answer

CVE-2026-20262 affects Cisco Cisco Catalyst SD-WAN Manager and is rated medium (CVSS 6.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-06-15: attackers are using it, so patch it first.

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.

Weakness: CWE-22.

Severity

6.5 medium

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

Exploited (CISA KEV)

Yes, since Jun 15, 2026

Federal due date Jun 29, 2026

EPSS, next 30 days

29%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

What CISA says to do

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…

Affected products

Cisco Catalyst SD-WAN Manager. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-20262 being exploited?

Yes. CISA added CVE-2026-20262 to its Known Exploited Vulnerabilities catalog on 2026-06-15, with a federal remediation due date of 2026-06-29.

How do I fix CVE-2026-20262?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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