Cisco Webex Meetings up to 45.4 Web-based User Interface cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in Cisco Webex Meetings. This vulnerability affects unknown code of the component Web-based User Interface. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-20233. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Cisco Webex Meetings. Affected is an unknown code block of the component Web-based User Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at sec.cloudapps.cisco.com. This vulnerability is traded as CVE-2026-20233 since 10/08/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/03/2026). The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Unified Communication Software

Vendor

• Cisco

Name

• Webex Meetings

Version

• 39.6
• 39.7
• 39.7.4
• 39.7.7
• 39.8
• 39.8.2
• 39.8.3
• 39.8.4
• 39.9
• 39.9.1
• 39.10
• 39.11
• 40.1
• 40.2
• 40.4
• 40.4.10
• 40.6
• 40.6.2
• 42.6
• 42.7
• 42.8
• 42.9
• 42.10
• 42.11
• 42.12
• 43.1
• 43.2
• 43.3
• 43.4
• 43.4.1
• 43.4.2
• 43.5.0
• 43.6.0
• 43.6.1
• 43.7
• 43.8
• 43.9
• 43.10
• 43.11
• 43.12
• 44.1
• 44.2
• 44.3
• 44.4
• 44.5
• 44.6
• 44.7
• 44.8
• 44.9
• 44.10
• 44.11
• 44.12
• 45.1
• 45.2
• 45.3
• 45.4

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion