Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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 write access. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ Security Impact Rating: Medium CVE: CVE-2026-20262
CSIRTS triage
- What
- The vulnerability allows an authenticated, remote attacker to create or overwrite any file on the filesystem of an affected system.
- Who is affected
- Authenticated users with write access to Cisco Catalyst SD-WAN Manager.
- Urgency
- Remediation is important as the vulnerability is actively exploited and has medium severity.
- Action
- Update to the latest software version released by Cisco.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-20262Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 94% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20262 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Cisco Catalyst SD-WAN
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerabilitycisco-psirt · 2026-06-16
- highexploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerabilitycisco-psirt · 2026-06-16
- unknownNCSC-2026-0199 [1.00] [M/H] Vulnerability fixed in Cisco Catalyst SD-WAN Managerncsc-nl · 2026-06-16
- criticalexploitedCVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerabilitycisa-kev · 2026-06-15
- unknownexploitedCisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privile…cisco-psirt · 2026-06-12
- criticalexploitedCVE-2026-20245: Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerabilitycisa-kev · 2026-06-09
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