CVE-2026-20262
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. High risk of data tampering.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- 2026-06-15 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- PublishedDisclosed publicly on CVE.org and NVD
- 2026-06-29 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 29.1% in the next 30 days (EPSS).
- Severity: 6.5 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2026-06-15
- Exploit probability
- 29.1% · EPSS, next 30 days
- Weakness
- CWE-22 · Path traversal
- Record status
- Analyzed
Affected
- Cisco Catalyst sd-wan Manager < 20.9.9.2
- Cisco Catalyst sd-wan Manager < 20.12.7.2
- Cisco Catalyst sd-wan Manager < 20.15.4.5
- Cisco Catalyst sd-wan Manager < 20.15.5.3
- Cisco Catalyst sd-wan Manager < 20.18.3.1
- Cisco Catalyst sd-wan Manager < 26.1.1.2
Attack profile CVSS 3.1 · 6.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-20262.md and follow it. Check whether this project is affected by CVE-2026-20262. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
