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CVE-2026-20184 is a critical authentication vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services. The flaw is caused by improper certificate validation during the SSO trust and token validation process. Because the service did not correctly validate certificates associated with the authentication flow, a remote attacker could connect to a Webex service endpoint and submit a crafted authentication token that could be accepted as legitimate. Successful exploitation would allow the attacker to impersonate any user within the affected Webex environment and obtain unauthorized access to legitimate Cisco Webex services available to that user.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Cisco Webex Services vulnerability in SSO integration with Control Hub caused by improper certificate validation, allowing an unauthenticated remote attacker to impersonate any user.
An improper certificate validation vulnerability in Webex SSO integration with Control Hub that could allow unauthenticated user impersonation and unauthorized access to Webex services.
A critical Cisco Webex vulnerability affecting SSO integration with Control Hub that could allow a remote attacker to impersonate any user by exploiting flawed certificate validation and forging an authentication token.
An improper certificate validation flaw in Cisco Webex Services SSO integration with Control Hub that could let an unauthenticated remote attacker impersonate any user and gain unauthorized access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.