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How the CVE Works
CVE-2025-20246 is a stored Cross-Site Scripting (XSS) vulnerability in Cisco Webex due to improper input sanitization. Attackers inject malicious JavaScript payloads into user-controllable fields (e.g., chat messages, meeting notes). When another user views the manipulated content, the script executes in their browser session, allowing session hijacking, credential theft, or malware delivery. The attack requires no authentication—only a crafted link or embedded payload. Cisco Webex fails to validate/sanitize input in certain parameters, enabling arbitrary script execution under the victim’s privileges.
DailyCVE Form
Platform: Cisco Webex
Version: Pre-42.1.0
Vulnerability: Stored XSS
Severity: Critical
Date: 2025-07-14
Prediction: Patch expected by 2025-08-30
What Undercode Say
curl -X POST "https://webex.com/api/v1/chat" -d '{"message":"<script>alert(1)</script>"}'
nmap -p 443 --script http-xss webex-target.com
How Exploit
1. Attacker crafts malicious link with XSS payload.
- Victim clicks link, payload executes in Webex interface.
3. Attacker steals session cookies via `document.cookie`.
Protection from this CVE
- Update to Webex 42.1.0+.
- Implement CSP headers.
- Sanitize user input server-side.
Impact
- Session hijacking.
- Data exfiltration.
- Malware distribution.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
