CVE-2026-101151 in CloudVision Portal
Summary
by MITRE • 10/06/2026
Insufficient validation of request in login flow could allow a remote, unauthenticated attacker to craft a URL that, when clicked by a user, redirects the user's browser to an arbitrary external site upon completion of the authentication process.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability described constitutes a classic Open Redirect flaw within an application's authentication workflow, specifically targeting the post-login redirection mechanism. This security weakness arises from insufficient validation of user-supplied input in the redirect parameter or URL component used after successful credential verification. In many web applications, it is common practice to allow users to return to their originally requested page after logging in by passing a target URL as a query string argument. When this value is not rigorously sanitized against an allowed list of domains or patterns, attackers can manipulate the input to point to malicious external destinations rather than legitimate internal paths.
From a technical perspective, the flaw lies in the application's failure to enforce strict domain whitelisting when processing the redirect target. Instead of validating that the destination URL belongs to the same origin as the web application itself, the server blindly accepts and executes any provided string. This allows an unauthenticated attacker to construct a specially crafted link containing their own malicious domain within the redirection parameter. When this link is presented to a victim who possesses valid credentials for the target service, the authentication process proceeds normally, but upon completion, the browser is instructed by the application's response header or script to navigate away from the trusted site and toward the attacker-controlled endpoint.
The operational impact of this vulnerability extends beyond simple misdirection; it serves as a powerful vector for social engineering attacks such as phishing and credential harvesting. Because the initial part of the URL displayed in the browser address bar belongs to the legitimate, trusted organization, users are significantly more likely to trust the link than if they had received a direct link from an unknown source. An attacker can exploit this trust by embedding their malicious domain at the end of the redirection chain or using it as the final destination after authentication. This technique effectively bypasses user skepticism regarding suspicious links, facilitating the theft of sensitive information, session hijacking through subsequent phishing pages that mimic legitimate interfaces, or the distribution of malware via drive-by downloads hosted on the external site.
In terms of industry classification standards, this vulnerability aligns with CWE-601, which defines URL Redirection to Untrusted Site (Open Redirect). It also maps directly to MITRE ATT&CK technique T1583.002, specifically Domain Fronting or Open Redirect abuse for phishing campaigns. The lack of input validation represents a fundamental failure in security-by-design principles, where user-controlled data is treated as executable logic without proper sanitization checks against predefined safe patterns.
To mitigate this risk, developers must implement strict allow-listing mechanisms for all redirect targets rather than relying on block lists or simple string matching that can be easily bypassed using encoding tricks or subdomain variations. The application should validate the host component of any provided URL and ensure it matches one of a pre-approved list of domains belonging to the organization. Alternatively, applications can avoid accepting arbitrary URLs altogether by storing intended destinations in secure server-side sessions after initial authentication requests are made, thereby removing user-controlled input from the final redirection step entirely. Regular security testing using automated scanners that specifically probe for open redirect vulnerabilities is also recommended to identify and remediate such flaws before they can be exploited in production environments.