CVE-2025-20328
📋 TL;DR
This vulnerability allowed authenticated low-privileged attackers to conduct cross-site scripting (XSS) attacks against Cisco Webex Meetings users via crafted links. It affected users of the web-based interface through insufficient input validation in user profiles. Cisco has patched this service-side vulnerability, requiring no customer action.
💻 Affected Systems
- Cisco Webex Meetings
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, hijack user accounts, perform actions as the victim, or redirect to malicious sites.
Likely Case
Session hijacking, credential theft, or limited account compromise through social engineering.
If Mitigated
Minimal impact with proper input validation and output encoding in place.
🎯 Exploit Status
Requires authenticated low-privileged access and user interaction (clicking crafted link).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Service-side fix deployed by Cisco
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-55bv8hhm
Restart Required: No
Instructions:
No action required - Cisco has addressed the vulnerability in their service infrastructure.
🔧 Temporary Workarounds
User awareness training
allEducate users to avoid clicking suspicious links in Webex Meetings
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Use browser extensions that block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check if Webex Meetings service is using the patched version via Cisco's advisoryCheck Version:
Contact Cisco support or check service status in Webex Control HubVerify Fix Applied:
Verify with Cisco that service-side fix has been applied to your organization's instance📡 Detection & Monitoring
Log Indicators:
- Unusual user profile modifications
- Suspicious URL parameters in access logs
Network Indicators:
- Requests with crafted parameters to user profile endpoints
SIEM Query:
webex AND (profile OR user) AND (script OR javascript OR alert)