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6.1
MEDIUM CVSS 3.1
CVE-2026-20233
Cisco Webex Meetings Cross-Site Scripting Vulnerability
Overview
Description

A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.

Details
INFO

Published Date :

June 3, 2026, 6:16 p.m.

Last Modified :

July 22, 2026, 7:10 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-20233 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco webex_meetings
2 Cisco webex
: Total Affected Vendor : 1 | Products : 2
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM MITRE-CVE
Solution
Cisco Webex Meetings service has been updated to fix an XSS vulnerability. No customer action is required.
  • Ensure you are using the updated Webex Meetings service.
References
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-2026-20233.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20233 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-2026-20233 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-2026-20233 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20233 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.

  • CVE Translated by [email protected]

    Jul. 22, 2026

    Action Type Old Value New Value
    Added Translation Title: Cisco Webex Meetings de Cisco, Description: Una vulnerabilidad en la interfaz de usuario basada en web de Cisco Webex Meetings podría haber permitido a un atacante remoto no autenticado realizar un ataque de cross-site scripting (XSS). Cisco ha abordado esta vulnerabilidad en el servicio Webex Meetings, y no se requiere ninguna acción por parte del cliente. Esta vulnerabilidad existía debido a una validación insuficiente de la entrada del usuario. Antes de que esta vulnerabilidad fuera abordada, un atacante podría haber explotado esta vulnerabilidad persuadiendo a un usuario para que siguiera un enlace malicioso. Un exploit exitoso podría haber permitido al atacante ejecutar código de script arbitrario en el navegador del usuario objetivo o acceder a información sensible basada en el navegador.
  • CVE Modified by [email protected]

    Jun. 17, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Cisco', 'product': 'Cisco Webex Meetings', 'versions': [{'status': 'affected', 'version': '39.7.7'}, {'status': 'affected', 'version': '39.9'}, {'status': 'affected', 'version': '40.4.10'}, {'status': 'affected', 'version': '39.6'}, {'status': 'affected', 'version': '40.6.2'}, {'status': 'affected', 'version': '39.8.2'}, {'status': 'affected', 'version': '39.8.4'}, {'status': 'affected', 'version': '40.1'}, {'status': 'affected', 'version': '39.11'}, {'status': 'affected', 'version': '39.7.4'}, {'status': 'affected', 'version': '39.9.1'}, {'status': 'affected', 'version': '40.4'}, {'status': 'affected', 'version': '40.6'}, {'status': 'affected', 'version': '39.7'}, {'status': 'affected', 'version': '39.8'}, {'status': 'affected', 'version': '39.8.3'}, {'status': 'affected', 'version': '40.2'}, {'status': 'affected', 'version': '39.10'}, {'status': 'affected', 'version': '42.6'}, {'status': 'affected', 'version': '42.7'}, {'status': 'affected', 'version': '42.8'}, {'status': 'affected', 'version': '42.9'}, {'status': 'affected', 'version': '42.10'}, {'status': 'affected', 'version': '42.11'}, {'status': 'affected', 'version': '42.12'}, {'status': 'affected', 'version': '43.1'}, {'status': 'affected', 'version': '43.2'}, {'status': 'affected', 'version': '43.3'}, {'status': 'affected', 'version': '43.4'}, {'status': 'affected', 'version': '43.4.1'}, {'status': 'affected', 'version': '43.4.2'}, {'status': 'affected', 'version': '43.5.0'}, {'status': 'affected', 'version': '43.6.0'}, {'status': 'affected', 'version': '43.6.1'}, {'status': 'affected', 'version': '43.7'}, {'status': 'affected', 'version': '43.8'}, {'status': 'affected', 'version': '43.9'}, {'status': 'affected', 'version': '43.10'}, {'status': 'affected', 'version': '43.11'}, {'status': 'affected', 'version': '43.12'}, {'status': 'affected', 'version': '44.1'}, {'status': 'affected', 'version': '44.2'}, {'status': 'affected', 'version': '44.3'}, {'status': 'affected', 'version': '44.4'}, {'status': 'affected', 'version': '44.5'}, {'status': 'affected', 'version': '44.6'}, {'status': 'affected', 'version': '44.7'}, {'status': 'affected', 'version': '44.8'}, {'status': 'affected', 'version': '44.9'}, {'status': 'affected', 'version': '44.10'}, {'status': 'affected', 'version': '44.11'}, {'status': 'affected', 'version': '44.12'}, {'status': 'affected', 'version': '45.1'}, {'status': 'affected', 'version': '45.2'}, {'status': 'affected', 'version': '45.3'}, {'status': 'affected', 'version': '45.4'}], 'defaultStatus': 'unknown'}]
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 17, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-20233', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-03T17:46:57.004996Z'}
  • Initial Analysis by [email protected]

    Jun. 08, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:cisco:webex_meetings:40.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.7.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.7.7:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.8.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.8.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.8.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.9.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:40.4.10:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:40.6.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.4.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.5.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.4.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.10.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.11.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.7.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.8.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:39.9.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:40.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:40.2.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:40.4.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.10.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.11.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.12.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.7.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.8.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:42.9.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.10.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.11.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.12.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.2.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.3.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.4.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.6.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.7.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.8.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:43.9.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.10.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.11.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.12.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.2.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.3.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.4.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.5.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.7.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.8.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:44.9.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:45.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:45.2.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:45.3.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:webex_meetings:45.4.0:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS Types: Vendor Advisory
  • New CVE Received by [email protected]

    Jun. 03, 2026

    Action Type Old Value New Value
    Added Description A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Added CWE CWE-79
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 6.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact