CVE-2025-26202
📋 TL;DR
This CVE describes a stored Cross-Site Scripting (XSS) vulnerability in DZS router web interfaces. An authenticated attacker can inject malicious JavaScript into the WPA/WAPI passphrase field, which executes when administrators view the passphrase via the 'Click here to display' option. This affects administrators of DZS routers with vulnerable web interfaces.
💻 Affected Systems
- DZS Router Web Interface
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal administrator session cookies, perform actions as the administrator, or redirect to malicious sites, potentially leading to full router compromise.
Likely Case
Attackers with router access could steal administrator credentials or session tokens, enabling further network compromise.
If Mitigated
With proper input validation and output encoding, the malicious script would be rendered harmless as text rather than executed.
🎯 Exploit Status
Exploitation requires authenticated access to router web interface; stored XSS payload executes when administrator views passphrase
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Check DZS vendor website for security advisories
2. Apply any available firmware updates
3. Verify fix by testing XSS payload injection
🔧 Temporary Workarounds
Disable 'Click here to display' functionality
allRemove or disable the passphrase display option that triggers the XSS execution
Implement input validation
allAdd server-side validation to reject JavaScript in passphrase fields
🧯 If You Can't Patch
- Restrict router web interface access to trusted administrators only
- Implement network segmentation to isolate router management interfaces
🔍 How to Verify
Check if Vulnerable:
Attempt to inject basic XSS payload like <script>alert('XSS')</script> into WPA/WAPI passphrase field and check if it executes when viewing via 'Click here to display'Check Version:
Check router web interface for firmware version informationVerify Fix Applied:
Test same XSS payload injection; it should be properly encoded/escaped and not execute📡 Detection & Monitoring
Log Indicators:
- Unusual passphrase entries containing script tags or JavaScript syntax
- Multiple failed login attempts followed by passphrase modifications
Network Indicators:
- Unusual HTTP requests to router web interface with encoded payloads in POST data
SIEM Query:
web.url:*passphrase* AND (web.query:*script* OR web.query:*javascript* OR web.query:*alert*)