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CVE-2026-20262

Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability

CVSS 3.1 Medium 6.5Known exploited (CISA KEV)

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

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.

Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 Medium 6.5

Score published by cisco in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: None

    No effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: None

    No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.29116 (29.1% probability)
Percentile
98.2%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability
Added to the catalog
Jun 15, 2026
Federal due date
Jun 29, 2026

CISA assessment as of Jun 15, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
partial

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-22Improper Limitation of a Pathname to a Restricted Directory

Affected products

Products listed in the CVE record, as the CNA published them.

  • Cisco Catalyst SD-WAN Manager

    • affected: 20.1.12
    • affected: 19.2.1
    • affected: 18.4.4
    • affected: 18.4.5
    • affected: 20.1.1.1
    • affected: 20.1.1
    • affected: 19.3.0
    • affected: 19.2.2
    • affected: 19.2.099
    • affected: 18.3.6
    • affected: 18.3.7
    • affected: 19.2.0
    • affected: 18.3.8
    • affected: 19.0.0
    • affected: 19.1.0
    • affected: 18.4.302
    • affected: 18.4.303
    • affected: 19.2.097
    • affected: 19.2.098
    • affected: 17.2.10
    • affected: 18.3.6.1
    • affected: 19.0.1a
    • affected: 18.2.0
    • affected: 18.4.3
    • affected: 18.4.1
    • and 351 more

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Added to CISA KEV
  3. Record published
  4. Record last updated

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About CubePath

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:09 UTC. Sources and licenses