CVE-2025-6701 in xxl-sso
Summary
by MITRE • 06/26/2025
A vulnerability, which was classified as problematic, has been found in Xuxueli xxl-sso 1.1.0. This issue affects some unknown processing of the file /xxl-sso-server/doLogin. The manipulation of the argument redirect_url leads to open redirect. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 07/10/2025
The vulnerability identified as CVE-2025-6701 represents a critical security flaw within the Xuxueli xxl-sso 1.1.0 single sign-on server implementation. This issue resides in the authentication processing logic at the /xxl-sso-server/doLogin endpoint where improper input validation allows for malicious manipulation of the redirect_url parameter. The flaw enables attackers to craft specially crafted requests that redirect users to arbitrary external domains, creating a dangerous open redirect condition that can be exploited for various malicious purposes including phishing attacks and credential theft. The vulnerability's classification as problematic indicates its potential for significant impact within affected systems that rely on this authentication framework for user access control and session management.
The technical exploitation of this vulnerability occurs through the manipulation of the redirect_url argument within the authentication flow, specifically targeting the doLogin endpoint. When users attempt to authenticate through the vulnerable system, the application fails to properly validate or sanitize the redirect parameter, allowing an attacker to inject malicious URLs that will be used for subsequent redirects. This open redirect vulnerability stems from inadequate input sanitization and validation mechanisms within the application's authentication handler. The flaw operates at the application layer and can be exploited remotely without requiring any special privileges or authentication, making it particularly dangerous for widespread deployment. According to CWE classification, this represents a CWE-601: URL Redirection to Untrusted Site ('Open Redirect') vulnerability that falls under the broader category of injection flaws.
The operational impact of this vulnerability extends beyond simple redirection attacks and can severely compromise user security and system integrity. Attackers can leverage this flaw to create convincing phishing pages that appear to be legitimate authentication portals, potentially capturing user credentials and session information. The open redirect condition can also be used to facilitate more sophisticated attacks such as cross-site scripting exploitation or to bypass security controls that rely on proper URL validation. Organizations using xxl-sso 1.1.0 may experience unauthorized access attempts, potential data breaches, and compromised user trust. The vulnerability's public disclosure without vendor response creates an immediate risk environment where attackers can freely exploit this weakness without any mitigation efforts from the software vendor, potentially affecting numerous systems that depend on this authentication framework for secure access control.
Mitigation strategies for CVE-2025-6701 should prioritize immediate patching of the vulnerable xxl-sso 1.1.0 software version to address the input validation flaw in the redirect_url parameter handling. Organizations should implement strict input validation and sanitization measures for all redirect parameters, ensuring that only trusted and predetermined URLs are accepted for redirection. Network-level controls including web application firewalls and URL filtering mechanisms can provide additional protection by blocking suspicious redirect attempts. Security teams should conduct comprehensive vulnerability assessments to identify all systems using the affected software version and implement proper monitoring for exploitation attempts. The mitigation approach aligns with ATT&CK technique T1566.002: Phishing: Spearphishing Attachment, as the vulnerability enables attackers to create convincing phishing redirection scenarios. Additionally, implementing proper logging and alerting mechanisms around authentication endpoints will help detect exploitation attempts and provide forensic evidence for incident response activities. Organizations should also consider implementing secure coding practices and regular security testing to prevent similar vulnerabilities in future development cycles.