NCSC-2026-0199 [1.00] [M/H] Vulnerability fixed in Cisco Catalyst SD-WAN Manager

unknownpublic exploitCVE-2026-20262

Cisco has fixed a vulnerability in Cisco Catalyst SD-WAN Manager. The vulnerability is in the web user interface of Cisco Catalyst SD-WAN Manager and concerns a directory traversal flaw. This is caused by improper input validation during the file upload process. An authenticated attacker can create or overwrite arbitrary files on the underlying system. Upon successful exploitation, the attacker can gain root-level access, affecting system integrity. Cisco reports having information that the vulnerability has been exploited in a limited manner.

CSIRTS triage

vendor: Cisco product: Catalyst SD-WAN Manager Path traversal Privilege escalation

What: The vulnerability is a directory traversal flaw in the web user interface.
Who is affected: Authenticated attackers can exploit this vulnerability to gain root-level access.
Urgency: Remediation is urgent due to confirmed limited exploitation.
Action: Apply the latest patches provided by Cisco.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Catalyst SD-WAN Manager

Get an email when a new Catalyst SD-WAN Manager advisory drops — max one per day, one-click unsubscribe.

Details

Source: NCSC-NL Advisories (NL · national-cert · site)
Severity: unknown
Published: 2026-06-16
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://advisories.ncsc.nl/advisory?id=NCSC-2026-0199

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.

Moderate exploitation riskCVE-2026-202627.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. 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.

mediumexploitedCisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerabilitycisco-psirt
criticalexploitedCVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerabilitycisa-kev

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
mediumexploitedCisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerabilitycisco-psirt · 2026-06-15
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