CVE-2026-59802 in PasswordPusher
Summary
by MITRE • 07/08/2026
PasswordPusher before 2.8.1 accepts data URI schemes in URL push payloads due to insufficient validation in the valid_url function. Attackers can create malicious pushes containing data:text/html URIs that execute arbitrary JavaScript in victims' browsers when clicked, enabling phishing and credential theft under the trusted PasswordPusher domain.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/08/2026
The vulnerability in PasswordPusher versions prior to 2.8.1 represents a critical security flaw that stems from inadequate input validation within the valid_url function implementation. This weakness allows attackers to exploit the application's URL handling mechanism by submitting data URI schemes as part of push payloads, specifically targeting the data:text/html format which can execute arbitrary JavaScript code when rendered in web browsers. The issue manifests as a bypass of normal URL validation procedures that should prevent potentially malicious content from being accepted into the system.
The technical exploitation occurs through the manipulation of URL push functionality where attackers craft malicious payloads containing data URIs that embed HTML and JavaScript content directly within the URI itself. When legitimate users click on these malicious links, the embedded code executes within their browser context under the trusted PasswordPusher domain, creating a sophisticated phishing attack vector that can harvest credentials and personal information. This vulnerability operates at the intersection of insecure input handling and cross-site scripting risks, creating an environment where attackers can leverage the application's own trust relationship with users.
The operational impact of this vulnerability extends beyond simple credential theft to encompass comprehensive user data compromise and potential lateral movement within affected networks. Attackers can craft sophisticated phishing campaigns that appear legitimate due to the trusted domain association, making user detection and prevention significantly more challenging. The attack surface includes any user who interacts with malicious push notifications, potentially affecting organizations that rely on PasswordPusher for secure credential sharing and management operations.
Security mitigations should focus on implementing robust input validation that explicitly rejects data URI schemes and other non-standard URL formats within the valid_url function. Organizations should immediately upgrade to PasswordPusher version 2.8.1 or later where this vulnerability has been addressed through enhanced validation mechanisms. Additional defensive measures include monitoring for unusual URL patterns in push notifications, implementing content security policies that restrict execution of inline scripts, and educating users about the risks of clicking untrusted links even when appearing to originate from legitimate services. This vulnerability aligns with CWE-20 Input Validation and CWE-79 Cross-Site Scripting categories, while operating within ATT&CK techniques covering credential access and phishing campaigns.
The remediation process requires comprehensive code review of URL validation functions throughout the application, implementation of strict whitelist validation for acceptable URI schemes, and regular security testing to prevent similar vulnerabilities from emerging in other components. Organizations should also consider implementing additional layers of protection such as browser-based security controls and network-level monitoring to detect and block malicious data URI traffic patterns that may attempt to exploit this or similar vulnerabilities in the future.