Privilege Escalation in Cisco Umbrella Virtual Appliance (CVE-2026-20246)
Summary
Vulnerability in Cisco Umbrella Virtual Appliance (CVE-2026-20246). Confidential information can be exposed externally.
Original description
The description as published by the source.
A vulnerability in the vmadmin CLI of Cisco Umbrella Virtual Appliance could allow an authenticated, local attacker to elevate privileges on an affected device.
This vulnerability is due to insufficient validation of user-supplied commands. An attacker with vmadmin privileges could exploit this vulnerability by using certain commands at the CLI. A successful exploit could allow the attacker to elevate privileges to root.
Source: Cisco Security Advisories NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-20246 has been found in Cisco Umbrella Virtual Appliance.
Confidential information can be exposed externally. CVSS score: 6.0/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Cisco Umbrella Virtual Appliance CVE-2026-20246" on the vendor's site.
CVE-2026-20246 (Cisco Umbrella Virtual Appliance) — CWE-269 / CVSS v3 6.0
Attack vector: local / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-269) exists in Cisco Umbrella Virtual Appliance.
Check the vendor advisory for the affected versions of Cisco Umbrella Virtual Appliance.
Severity: Medium (CVSS 6.0/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Cisco Umbrella Virtual Appliance を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- CISCO sec.cloudapps.cisco.com
- patch psirt@cisco.com
- web nvd.nist.gov
- web github.com