CVE-2023-20132 in Webex Meetings
Summary
by MITRE • 04/05/2023
Multiple vulnerabilities in the web interface of Cisco Webex Meetings could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack or upload arbitrary files as recordings. For more information about these vulnerabilities, see the Details section of this advisory.
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Analysis
by VulDB Data Team • 08/24/2025
The vulnerability identified as CVE-2023-20132 represents a critical security flaw within Cisco Webex Meetings web interface that exposes organizations to significant remote attack vectors. This issue affects the enterprise collaboration platform widely used for virtual meetings and recording capabilities, making it a prime target for malicious actors seeking to exploit authenticated access points. The vulnerability stems from inadequate input validation and sanitization mechanisms within the web application's user interface components, creating persistent security gaps that can be exploited by attackers who have already gained legitimate credentials.
The technical implementation of this vulnerability manifests through two primary attack vectors that demonstrate poor security controls in the application's architecture. The first vector enables stored cross-site scripting attacks where malicious scripts can be injected into the web interface and subsequently executed against other authenticated users who view affected content. This type of vulnerability maps directly to CWE-79 which defines cross-site scripting as a common web application security weakness. The second vector allows for arbitrary file uploads that can be processed as meeting recordings, potentially enabling attackers to deploy malicious payloads that persist within the system's recording storage mechanisms.
The operational impact of CVE-2023-20132 extends beyond simple data exfiltration or service disruption, as it creates persistent backdoor opportunities for attackers to maintain access within corporate networks. When combined with the stored XSS capability, attackers can establish a foothold that survives user sessions and system restarts, making it particularly dangerous for enterprise environments. The vulnerability's exploitation requires only authenticated access, which significantly lowers the attack threshold compared to unauthenticated exploits, as many organizations implement multi-factor authentication for their collaboration platforms. This makes the attack surface particularly concerning for organizations that rely heavily on Webex for business-critical communications and meetings.
Organizations should implement immediate mitigations including comprehensive input validation for all user-supplied data, enhanced file type filtering for recording uploads, and regular security assessments of the web interface components. The vulnerability's characteristics align with ATT&CK technique T1566 which covers social engineering attacks, and T1078 which addresses valid accounts for maintaining access. Security teams should also consider implementing web application firewalls to monitor for suspicious upload patterns and XSS attempts. Additionally, regular security awareness training for users can help prevent credential compromise that would enable exploitation of this vulnerability. The remediation process should include thorough code review of the web interface components, implementation of proper content security policies, and establishment of monitoring procedures to detect potential exploitation attempts.