How severe is CVE-2026-20262?

CVE-2026-20262 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-20262 being actively exploited?

Yes. CVE-2026-20262 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-15, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-20262?

CVE-2026-20262 affects Cisco Catalyst Sd-wan Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-20262?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-20262 have an EU (EUVD) identifier?

Yes. CVE-2026-20262 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36733. It is also flagged as exploited in the EUVD (since 2026-06-15).

When was CVE-2026-20262 published?

CVE-2026-20262 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-20262

CVE-2026-20262 is a medium-severity vulnerability in Cisco Catalyst Sd-wan Manager with a CVSS 3.x base score of 6.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-15). The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-06-15)
EU (EUVD) id: EUVD-2026-36733
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-06-15)
Weakness: CWE-22
Affected product: Cisco Catalyst Sd-wan Manager
Published: 2026-06-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-20262?: 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.
How severe is CVE-2026-20262?: CVE-2026-20262 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-20262 being actively exploited?: Yes. CVE-2026-20262 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-15, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-20262?: CVE-2026-20262 affects Cisco Catalyst Sd-wan Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-20262?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-20262 have an EU (EUVD) identifier?: Yes. CVE-2026-20262 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36733. It is also flagged as exploited in the EUVD (since 2026-06-15).
When was CVE-2026-20262 published?: CVE-2026-20262 was published on 2026-06-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*

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