CVE-2023-20104 Cisco Webex App for Web Cross-Site Scripting Vulnerability
An unauthenticated attacker can execute arbitrary script code or access sensitive browser information via a crafted file and URL in Cisco Webex App for Web.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-20104?
CVE-2023-20104 is a medium-severity cross-site scripting vulnerability in Cisco Webex Teams, published on 3 Mar 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A vulnerability in the file upload functionality of Cisco Webex App for Web could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending an arbitrary file to a user and persuading that user to browse to a specific URL. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
Weakness: CWE-79
Which versions are affected by CVE-2023-20104?
It affects 1 product.
Products include Cisco Webex Teams.
How do I fix CVE-2023-20104?
No fix has been published for CVE-2023-20104 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-20104 being exploited?
There is no known exploitation of CVE-2023-20104 in the wild and no public exploit code.
Other vulnerabilities in Cisco Webex Teams
- CVE-2025-20236 Cisco Webex App Client-Side Remote Code Execution Vulnerability
- CVE-2018-0387 Code injection in Cisco Webex Teams unknown
- CVE-2018-0436 Cisco Webex Teams Information Disclosure and Modification Vulnerability
- CVE-2020-3535 Cisco Webex Teams Client for Windows DLL Hijacking Vulnerability
- CVE-2019-1636 Cisco Webex Teams URI Handler Insecure Library Loading Vulnerability
Sources
Also known as GHSA-8cc5-x8g7-4w8h.