CVE-2025-70032: SunbirdEd-portal URL Redirect Vulnerability

CVE-2025-70032 Overview

CVE-2025-70032 is a URL Redirection to Untrusted Site vulnerability (CWE-601) discovered in Sunbird-Ed SunbirdEd-portal version 1.13.4. This open redirect vulnerability allows attackers to craft malicious URLs that redirect users from the legitimate SunbirdEd-portal application to attacker-controlled external websites. Such vulnerabilities are commonly exploited in phishing campaigns, credential theft attacks, and malware distribution schemes.

Critical Impact

Attackers can exploit this open redirect vulnerability to conduct phishing attacks by redirecting users to malicious sites that mimic legitimate login pages, potentially leading to credential theft and unauthorized access to sensitive educational platform data.

Affected Products

• Sunbird-Ed SunbirdEd-portal v1.13.4
• SunbirdEd-portal versions prior to patched releases

Discovery Timeline

• March 9, 2026 - CVE-2025-70032 published to NVD
• March 11, 2026 - Last updated in NVD database

Technical Details for CVE-2025-70032

Vulnerability Analysis

This vulnerability stems from improper URL validation in the SunbirdEd-portal application, an open-source education portal platform. The application fails to properly validate or sanitize redirect URLs, allowing attackers to manipulate URL parameters to redirect users to arbitrary external domains. When a user clicks on a crafted link that appears to originate from the trusted SunbirdEd-portal domain, they are silently redirected to an attacker-controlled website.

Open redirect vulnerabilities like this one are particularly dangerous in educational platforms where users inherently trust URLs from their institution's domain. The attack requires user interaction (clicking a malicious link), but the trusted appearance of the initial URL significantly increases the likelihood of successful exploitation.

Root Cause

The root cause of CVE-2025-70032 is insufficient input validation on URL redirect parameters within the SunbirdEd-portal application. The application accepts user-controlled input for redirect destinations without properly verifying that the target URL belongs to an allowed list of trusted domains or follows a whitelist pattern. This allows attackers to inject arbitrary external URLs into redirect parameters.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker constructs a malicious URL containing the legitimate SunbirdEd-portal domain with a manipulated redirect parameter pointing to an attacker-controlled site. The attacker then distributes this link through phishing emails, social media, or other channels. When a victim clicks the link, the SunbirdEd-portal processes the request and redirects the user to the malicious external site without proper validation.

The vulnerability is exploited through URL parameter manipulation. The malicious URL appears legitimate as it starts with the trusted SunbirdEd-portal domain, but contains a redirect parameter that points to an external malicious site. Technical details and a proof-of-concept demonstration are available in the GitHub Gist PoC.

Detection Methods for CVE-2025-70032

Indicators of Compromise

• Outbound HTTP/HTTPS requests from SunbirdEd-portal servers to unexpected external domains
• User access logs showing redirect requests with external URLs in query parameters
• Increased reports of phishing attempts referencing the SunbirdEd-portal domain
• Web server logs containing URL patterns with redirect parameters pointing to non-whitelisted domains

Detection Strategies

• Monitor web application logs for URL parameters containing external domain references in redirect-related fields
• Implement Web Application Firewall (WAF) rules to detect and block requests with suspicious redirect patterns
• Configure alerting on outbound traffic from the portal to newly registered or low-reputation domains
• Deploy endpoint detection to identify users being redirected to known malicious domains after visiting legitimate portal URLs

Monitoring Recommendations

• Enable verbose logging on SunbirdEd-portal instances to capture all redirect-related requests
• Implement real-time monitoring of URL parameters for external domain references
• Configure network security tools to flag traffic patterns indicative of open redirect exploitation
• Establish baseline user navigation patterns to identify anomalous redirect behavior

How to Mitigate CVE-2025-70032

Immediate Actions Required

• Review and audit all redirect functionality within the SunbirdEd-portal deployment
• Implement server-side URL validation to ensure redirects only target trusted domains
• Deploy a Web Application Firewall with rules to block open redirect attempts
• Educate users about the risks of clicking links even when they appear to originate from trusted domains

Patch Information

Organizations should monitor the SunbirdEd-portal GitHub repository for security updates and patches addressing this vulnerability. Upgrade to the latest available version once a fix is released by the Sunbird-Ed organization.

Workarounds

• Implement a strict allowlist of permitted redirect destinations at the application or WAF level
• Configure the web server to reject redirect requests containing external URLs
• Use relative URLs instead of absolute URLs for internal redirects where possible
• Deploy URL rewriting rules to strip or sanitize external redirect parameters

# Example WAF rule to block external redirects (ModSecurity)
SecRule ARGS "@rx (https?:\/\/(?!yourdomain\.com)[^\s]+)" \
    "id:1001,phase:1,deny,status:403,msg:'Potential open redirect attempt blocked'"