CVE-2026-20184
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service. This vulnerability existed because of improper certificate validation. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by connecting to a service endpoint and supplying a crafted token. A successful exploit could have allowed the attacker to gain unauthorized access to legitimate Cisco Webex services.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis vulnerability in Cisco Webex Control Hub's SSO integration allowed unauthenticated remote attackers to impersonate any user due to improper certificate validation. Attackers could exploit this by connecting to a service endpoint and supplying a crafted token, bypassing authentication and gaining unauthorized access to Webex services.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Webex Control Hub SSO integration is enabledLog into the Cisco Webex Control Hub admin portal and navigate to the SSO settings or Authentication section to determine if Single Sign-On (SSO) integration is currently configured and active.Affected if SSO integration is enabled and in use with the affected certificate validation mechanism.
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Review authentication logs for token-based anomaliesAccess Webex Control Hub logging or audit trails and search for authentication events involving crafted or suspicious tokens, particularly those originating from unfamiliar IP addresses or showing successful authentication without proper certificate verification.Affected if Logs contain entries of successful authentications using crafted tokens or authentication bypass attempts.
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Inspect SSO certificate validation configurationWithin the Webex Control Hub SSO settings, examine the certificate chain validation configuration to determine whether proper validation is enforced for the identity provider (IdP) certificates.Affected if Certificate validation is disabled, set to optional, or otherwise misconfigured for the SSO integration.
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Check for unauthorized user impersonationReview user activity logs and audit records for instances where user accounts were accessed from IP addresses or locations inconsistent with the user's typical usage patterns, which could indicate successful user impersonation via the vulnerability.Affected if There are authentication events showing unauthorized access to user accounts that were not initiated by those users.
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Identify unexpected service endpoint accessExamine API and service endpoint access logs for Webex Control Hub, looking for connections from unknown or untrusted sources that supplied tokens to the SSO service endpoint.Affected if There are records of unauthenticated or unauthorized connections to SSO service endpoints from external or unexpected sources.
A defender is affected if Webex Control Hub SSO integration is enabled and any signs of token-based authentication bypass, certificate validation misconfiguration, or user impersonation are found in logs or configuration.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor patch from Cisco for Control Hub SSO integration. Review authentication logs for signs of token abuse or unauthorized access prior to patching. Validate that proper certificate chain validation is enforced after the update.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
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Free · runs locallyCheck whether your project pulls in CVE-2026-20184 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-20184 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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