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CVE-2026-20262

MEDIUMCVSS 6.5/10Actively ExploitedEPSS 7.68%

Last modified

CVE-2026-20262 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 7.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
7.68%

93.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoCatalyst Sd-Wan Manager< 20.9.9.2
CiscoCatalyst Sd-Wan Manager>= 20.10, < 20.12.7.2
CiscoCatalyst Sd-Wan Manager>= 20.13, < 20.15.4.5
CiscoCatalyst Sd-Wan Manager>= 20.15.5, < 20.15.5.3
CiscoCatalyst Sd-Wan Manager>= 20.16, < 20.18.3.1
CiscoCatalyst Sd-Wan Manager>= 26.1, < 26.1.1.2

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20262?
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.
How severe is CVE-2026-20262?
CVE-2026-20262 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 7.68% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2026-20262?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20262?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST