CVE-2026-20184
Cisco Webex Meetings Certificate Validation Vulnerability
Description
A 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.
INFO
Published Date :
April 15, 2026, 5:17 p.m.
Last Modified :
April 17, 2026, 3:09 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Cisco Webex Services to the latest version.
- Validate SSO integration certificate configurations.
- Restart relevant services if required.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20184.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20184 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20184
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20184 vulnerability anywhere in the article.
-
The Cyber Express
Cisco Patches Critical ISE Vulnerabilities Allowing Remote Code Execution Attacks
Cisco has released security updates to fix multiple vulnerabilities in its Identity Services Engine and Webex Services, warning that successful exploitation could lead to remote code execution, root-l ... Read more
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The Hacker News
Cisco Patches Four Critical Identity Services, Webex Flaws Enabling Code Execution
Cisco has announced patches to address four critical security flaws impacting Identity Services and Webex Services that could result in arbitrary code execution and allow an attacker to impersonate an ... Read more
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CybersecurityNews
Cisco Webex Services Vulnerability Let Remote Attacker Impersonate Any User
Cisco has issued a critical security advisory warning of a severe vulnerability in its cloud-based Webex Services. Tracked as CVE-2026-20184, this flaw carries a maximum Common Vulnerability Scoring S ... Read more
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Daily CyberSecurity
RedSun: New Windows Defender Zero-Day Turns Protector into Attacker, PoC Publishes
Just as the cybersecurity community began digesting the latest round of patches for the high-profile “BlueHammer” vulnerability, a new storm has appeared on the horizon. On April 16, 2026, the securit ... Read more
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Daily CyberSecurity
Critical 9.8 Webex Flaw Lets Attackers Impersonate Any User
In the modern enterprise, the Single Sign-On (SSO) portal is the master key to a company’s digital life. However, a recently disclosed critical vulnerability in Cisco Webex Services has revealed how a ... Read more
The following table lists the changes that have been made to the
CVE-2026-20184 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Apr. 15, 2026
Action Type Old Value New Value Added Description A 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-295 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL