CVE-2026-80444 in AVESİS
Summary
by MITRE • 09/23/2026
URL redirection to untrusted site ('open redirect') vulnerability in Abis Technology Ltd. Co. AVESİS allows Input Data Manipulation.
This issue affects AVESİS: from 202608201331 before 202608240351.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified in Abis Technology Ltd. Co.'s AVESİS platform represents a classic open redirect flaw, technically classified under CWE-601 as URL Redirection to Untrusted Site ('Open Redirect'). This security defect arises from the application's failure to properly validate or sanitize user-supplied input before utilizing it for HTTP redirection operations. Specifically, when an authenticated or unauthenticated user interacts with certain endpoints within the AVESİS system, they can manipulate query parameters or form inputs to specify a destination URL that points to an external, potentially malicious domain rather than an internal resource of the application. The vulnerability exists in versions ranging from build 202608201331 up to but not including version 202608240351, indicating that earlier iterations lacked sufficient safeguards against this type of input manipulation.
From a technical perspective, open redirect vulnerabilities typically occur when web applications take user-controlled data and pass it directly into the location header or JavaScript window.location object without verifying if the target domain is whitelisted. In the context of AVESİS, an attacker can craft a specially constructed URL that appears to originate from the legitimate AVESİS infrastructure but actually redirects the victim's browser to a phishing site controlled by the adversary. This mechanism exploits the trust users place in known domains; because the initial part of the link belongs to Abis Technology Ltd., victims are more likely to click on it, believing they are still within the secure environment of the academic or administrative system managed by AVESİS.
The operational impact of this vulnerability is primarily centered around social engineering and credential harvesting campaigns rather than direct server compromise. Attackers can leverage this flaw in phishing attacks where emails or messages contain links that look legitimate but redirect to a fake login page designed to steal user credentials, such as university IDs or administrative passwords. Once the victim enters their information on the malicious site, the attacker gains unauthorized access to sensitive academic records, personal data, and institutional resources hosted within AVESİS. Additionally, this vulnerability can be used in cross-site request forgery attacks where a logged-in user is tricked into performing unintended actions by being redirected after clicking a malicious link, although credential theft remains the most prevalent threat vector associated with open redirects.
This flaw aligns with MITRE ATT&CK technique T1566.002, which describes Spearphishing Link sub-technique, where attackers send links to victims in spearphishing emails that redirect them to malicious sites for credential harvesting or malware installation. The ability to manipulate input data allows the attacker to bypass basic security perceptions and exploit human psychology rather than technical exploits of server-side logic vulnerabilities like SQL injection or remote code execution. While it does not directly expose backend databases, it serves as a critical entry point for initial access in many cyber-attack chains involving targeted institutions.
Mitigation strategies must focus on strict input validation and output encoding practices within the AVESİS application codebase. Developers should implement an allowlist approach for redirect destinations, ensuring that only predefined internal paths or explicitly trusted domains are permitted as targets for redirection operations. If dynamic redirects are necessary, the system should verify that the target domain matches a list of approved entities before processing the request. Furthermore, implementing security headers such as Content-Security-Policy with directives to restrict frame-ancestors and script-src can help mitigate some downstream effects, although server-side validation remains the primary defense. For organizations currently running affected versions between 202608201331 and 202608240351, immediate patching to version 202608240351 or later is essential to close this security gap and prevent potential phishing-based breaches.