CVE-2026-25351 in MyMedi Plugin
Summary
by MITRE • 03/25/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in skygroup MyMedi mymedi allows Reflected XSS.This issue affects MyMedi: from n/a through < 1.7.7.
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Analysis
by VulDB Data Team • 03/31/2026
This vulnerability represents a classic cross-site scripting flaw that specifically impacts the skygroup MyMedi mymedi web application. The issue manifests as improper neutralization of input during web page generation, creating a pathway for malicious actors to inject arbitrary javascript code into the application's response. The vulnerability is classified as reflected XSS because the malicious payload is reflected back to users through the application's response, typically via URL parameters or form inputs. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting conditions where input data is not properly sanitized or escaped before being rendered in web pages. The affected version range indicates that all versions prior to 1.7.7 are susceptible to this attack vector, suggesting a long-standing issue that was likely introduced during the application's development lifecycle.
The operational impact of this vulnerability is significant as it allows attackers to execute malicious scripts in the context of a victim's browser session. An attacker could craft malicious URLs containing javascript payloads that, when clicked by an unsuspecting user, would execute code in that user's browser. This could lead to session hijacking, credential theft, data exfiltration, or the redirection of users to malicious websites. The reflected nature of the vulnerability means that the attack requires user interaction through a malicious link, but once triggered, the payload executes with the privileges of the victim's browser session. This makes it particularly dangerous in environments where users may be less security-aware or when the application is used in corporate settings where users might click on links without proper verification.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1566 which covers social engineering attacks including phishing campaigns that leverage XSS vulnerabilities. The attack chain typically involves an attacker identifying vulnerable parameters in the application's URL structure, crafting malicious payloads that exploit the reflected XSS condition, and then delivering these payloads through phishing emails, compromised websites, or social media platforms. The vulnerability's impact is amplified by the fact that it affects a medical application, potentially exposing sensitive patient data or enabling attackers to manipulate medical records. Organizations using this application should consider implementing comprehensive input validation and output encoding mechanisms, including the use of Content Security Policy headers to mitigate the risk of script execution. The remediation strategy should focus on implementing proper input sanitization, parameter validation, and output encoding techniques that ensure all user-supplied data is properly escaped before being rendered in web pages. Additionally, regular security testing and code reviews should be conducted to identify and address similar vulnerabilities in other parts of the application's codebase.
The vulnerability demonstrates a fundamental weakness in the application's data handling processes where input validation is insufficient to prevent malicious content from being processed and reflected back to users. This represents a failure in the principle of least privilege and proper data sanitization that should be implemented at multiple layers of the application architecture. The issue highlights the critical importance of implementing defense-in-depth strategies that include both server-side input validation and client-side output encoding to prevent XSS attacks. Organizations should also consider implementing automated security scanning tools that can identify similar vulnerabilities in their applications and establish secure coding practices that prevent such issues from being introduced during the development phase.