CVE-2026-52873: Streambert: Global CSP Removal in Wyzie Redeem Window Enables Unconstrained XSS in Electron Renderer
Streambert is a cross-platform Electron Desktop App to stream and download video content. From version 2.5.0 until version 2.6.0, the wyzie-open-redeem IPC handler in index.js creates the partition:wyzie-redeem Electron session and registers an onHeadersReceived hook that removes the Content-Security-Policy header from every response in that session. The redeem window also lacks a setWindowOpenHandler restriction, so script injection in sub.wyzie.io, a loaded third-party resource, or a site reached through navigation executes without CSP constraints and can affect additional windows and persistent session storage. A user must open the Wyzie API key redemption window, and exploitation requires attacker-controlled script content in a loaded page. The resulting renderer script can invoke renderer-exposed application functionality and can be chained with other vulnerabilities to access internal services or sensitive data. This issue is fixed in version 2.6.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Streambert (Wyzie)to a version that resolves this vulnerability.Fixed in 2.6.0 - Compensating control
If you cannot upgrade immediately, do not load attacker-controlled or untrusted script content into the wyzie-redeem Electron session/window; limit navigation/resources in the redeem window (e.g., block or avoid third-party sites such as sub.wyzie.io) to reduce XSS and cross-window impact.
Event History
Frequently Asked Questions
Who is realistically exposed to this issue?
Users of Streambert versions 2.5.0 through versions before 2.6.0 are exposed when they open the Wyzie API key redemption window. The issue requires the user to open that window; it is not triggered solely by running the application.
What does an attacker need to exploit the flaw?
An attacker needs attacker-controlled script content in a page or resource loaded by the redemption window, such as sub.wyzie.io, a third-party resource, or a site reached through navigation. No application privileges are required, but user interaction is required.
What should users do if they cannot patch immediately?
Update Streambert to version 2.6.0, which fixes the issue. If updating cannot happen immediately, avoid opening the Wyzie API key redemption window.