CVE-2026-20262
Status: AnalyzedMedium (6.5)⚠ Active exploitation
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.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Base score: 6.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 28%
- Percentile among all scored CVEs: 98
- Score date: 9/30/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
CISA KEV — actively exploited
- Added to catalog: 6/15/2026
- Remediation due date: 6/29/2026
- Known ransomware use: Unknown
Affected technologies (1)
CWEs
- CWE-22
References
Raw JSON (NVD)
Show
{
"id": "CVE-2026-20262",
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"integrityImpact": "HIGH",
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],
"published": "2026-06-15T18:16:34.820",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ",
"tags": [
"Vendor Advisory"
],
"source": "psirt@cisco.com"
},
{
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262",
"tags": [
"US Government Resource"
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-22"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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.\r\n\r\nThis 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."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la interfaz de usuario web de Cisco Catalyst SD-WAN Manager, anteriormente SD-WAN vManage, podría permitir a un atacante remoto autenticado crear o sobrescribir cualquier archivo en el sistema de archivos de un sistema afectado.\n\nEsta vulnerabilidad existe porque el software afectado no valida correctamente la entrada proporcionada por el usuario durante un proceso de carga de archivos. Un atacante podría explotar esta vulnerabilidad enviando una solicitud HTTP manipulada a un endpoint de API afectado del sistema afectado. Un exploit exitoso podría permitir al atacante crear o sobrescribir cualquier archivo en el sistema operativo subyacente. Este archivo podría usarse posteriormente para escalar a root. Para explotar esta vulnerabilidad, el atacante debe tener credenciales válidas con al menos una cuenta de usuario de tarea única y con privilegios bajos."
}
],
"lastModified": "2026-07-24T19:10:00.160",
"cisaActionDue": "2026-06-29",
"cisaExploitAdd": "2026-06-15",
"configurations": [
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"nodes": [
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"sourceIdentifier": "psirt@cisco.com",
"cisaRequiredAction": "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.",
"cisaVulnerabilityName": "Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability"
}