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How the CVE Works
CVE-2025-20247 is a stored Cross-Site Scripting (XSS) vulnerability in Cisco Webex due to improper input sanitization in user-supplied data. An attacker crafts a malicious link containing JavaScript payloads, which Webex fails to filter. When a victim clicks the link, the script executes in their browser session, allowing session hijacking, data theft, or unauthorized actions. The attack requires minimal user interaction (clicking a link) and exploits Webex’s failure to encode output rendered in the web interface.
DailyCVE Form
Platform: Cisco Webex
Version: Prior to 42.10
Vulnerability: Stored XSS
Severity: Critical
Date: 07/14/2025
Prediction: Patch expected by 08/30/2025
What Undercode Say
curl -X POST 'https://webex.com/api/v1/messages' -d '{"text":"<script>alert(1)</script>"}'
document.cookie = "session=stolen; path=/";
How Exploit
1. Attacker sends malicious link:
`https://webex.com/meeting?param=`
2. Victim clicks link, payload executes.
Protection from this CVE
1. Update to Webex 42.10+.
2. Implement CSP headers.
3. Sanitize user input.
Impact
- Session hijacking.
- Data exfiltration.
- Unauthorized actions.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
