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How CVE-2025-20250 Works
CVE-2025-20250 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 executes when a victim clicks it. Since WebEx fails to filter dangerous characters (e.g., <script>alert(1)</script>), the payload renders in the victim’s browser, allowing session hijacking, phishing, or malware delivery. The attack requires no authentication, making it highly exploitable via phishing or embedded in meeting invites.
DailyCVE Form
Platform: Cisco WebEx
Version: Prior to 42.6
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/meeting' -d '{"message":"<script>exploit()</script>"}'
nmap -p 443 --script http-xss webex-target.com
// Proof-of-Concept (PoC)
document.write('<img src=x onerror=alert(document.cookie)>');
How Exploit
- Attacker embeds malicious script in WebEx meeting chat.
- Victim clicks link, payload executes in their browser.
- Attacker steals session cookies or redirects to phishing page.
Protection from this CVE
1. Update to WebEx version 42.6+.
2. Implement CSP headers.
3. Sanitize user input server-side.
Impact
- Session hijacking
- Data theft
- Malware delivery
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
