CVE-2025-10503 is a medium-severity vulnerability affecting the WSO2 Identity Server. This vulnerability allows the authentication endpoint to accept user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. As a result, attackers can inject malicious JavaScript payloads, enabling reflected cross-site scripting (XSS).
The CVSS score for this vulnerability is 6.1, indicating a medium severity level. Organizations must take this vulnerability seriously as it could lead to significant risks. Attackers may leverage this vulnerability to redirect users to malicious websites, modify the user interface, retrieve sensitive information from the browser, or cause other harmful actions. However, it is important to note that session hijacking is not possible due to the httpOnly flag protecting session-related cookies.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. Implementing proper input validation and output encoding practices is essential to prevent such vulnerabilities from being exploited.
The vulnerability was published on April 29, 2026, and is currently marked as analyzed. As of now, there are no known exploits or public proof-of-concept (PoC) available, but organizations must remain vigilant.
Vulnerability Details
Officially, the vulnerability is described as follows: The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. This allows for the injection of malicious JavaScript payloads, enabling reflected cross-site scripting.
The CWE classification for this vulnerability is CWE-79, which pertains to improper neutralization of input during web page generation ('cross-site scripting').
The CVSS vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating that the attack vector is network-based, the attack complexity is low, and user interaction is required.
Technical Analysis
The root cause of this vulnerability lies in the failure to properly validate user input on the authentication endpoint. This lack of enforcement allows for the injection of malicious scripts that can manipulate the user interface and redirect users to harmful sites.
The attack vector is through the network, requiring no privileges from the attacker and necessitating user interaction to trigger the payload. The attack complexity is low, making it relatively easy for an attacker to exploit this vulnerability.
The impacts on confidentiality and integrity are low, as attackers can access the user's session or modify the user interface but cannot hijack sessions due to the httpOnly flag on cookies.
Risk & Impact Analysis
Risk to organizations includes the potential for attackers to redirect users and exploit sensitive information through reflected cross-site scripting. The low complexity of exploiting this vulnerability increases the risk for organizations not implementing proper safeguards.
Organizations should assess the blast radius of this vulnerability and evaluate the potential impact on their operations. The urgency for remediation is medium; while there are no known active exploits, the ease of exploitation should compel organizations to schedule remediation promptly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is WSO2 Identity Server, specifically versions 7.1.0 to 7.1.0.28. Organizations should ensure they are running the latest version to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately. The recommended action is to upgrade to the latest version of WSO2 Identity Server that includes the necessary fixes. If patching is not immediately feasible, implement input validation and output encoding to prevent XSS attacks.
For further guidance on effective security practices, organizations can refer to the penetration testing services offered by AppSecure.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for unusual logins or redirection attempts. Behavioral anomalies such as unexpected changes to the user interface or requests to known malicious sites should also be flagged.
AppSecure Threat Intelligence Insight
CVE-2025-10503 represents a growing trend in vulnerabilities associated with improper input validation. Security teams must remain vigilant in monitoring for similar weaknesses in their systems. This incident underscores the importance of implementing robust input validation and output encoding practices.
Organizations looking to strengthen their security posture should consider regular security assessments and training for development teams. For more detailed guidance on vulnerability management, refer to our vulnerability management program design resources.
Additionally, organizations can benefit from understanding the nuances of penetration testing methodologies. Our blog on penetration testing methodology provides key insights into effective security practices.
In conclusion, CVE-2025-10503 is a reminder of the continual evolution of security threats. Proactive measures are essential to safeguard against such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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