CVE-2026-54165 in Dobase
Summary
by MITRE • 09/11/2026
Dobase is an open-source, self-hosted workspace with installable tools. Versions prior to 2026.06.03 have a one-click stored DOM-based cross-site scripting (XSS) vulnerability in the public, unauthenticated shared-folder image gallery. A file's `name` is fully attacker-controlled and is never sanitized. It is round-tripped through an ERB-escaped `data-name` attribute, decoded back to its raw value by `el.dataset.name`, and then re-injected into `innerHTML` by the `public-gallery` Stimulus controller with no escaping. Any authenticated workspace member who can share a Files folder can store a payload; the victim is anyone with the public share link (no authentication required). The global Content-Security-Policy is sent report-only (not enforcing), so an inline `onerror` handler executes — this is an executing XSS, not a CSP-mitigated injection. Version 2026.06.03 fixes the issue.
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Analysis
by VulDB Data Team • 09/11/2026
The vulnerability identified in Dobase versions prior to 2026.06.03 represents a critical security flaw rooted in improper handling of user-supplied input within a client-side JavaScript context, specifically classified under CWE-79 Improper Neutralization of Input During Web Page Generation known as Cross-site Scripting (XSS). This particular instance is categorized as DOM-based XSS because the malicious payload originates from an attacker-controlled source and is processed by the browser's Document Object Model rather than being reflected directly in the server response or stored permanently in a database for later retrieval. The attack vector exploits the public, unauthenticated shared-folder image gallery feature, which allows any authenticated workspace member to generate shareable links that can be accessed by anyone possessing the link without requiring authentication. This architectural design significantly expands the potential blast radius of the vulnerability beyond just internal users to include external parties who may receive a maliciously crafted share link via phishing or other social engineering tactics.
The technical mechanism of the exploit relies on a flawed data flow involving ERB templating and JavaScript DOM manipulation. When a file is uploaded, its name attribute is fully controlled by the attacker and undergoes no sanitization at the point of entry. The application initially renders this filename into an HTML element using an ERB-escaped `data-name` attribute, which correctly prevents immediate execution during server-side rendering. However, the vulnerability emerges when client-side JavaScript retrieves this value via `el.dataset.name`. This method decodes the escaped string back to its raw form, effectively reversing the initial protection layer. Subsequently, the public-gallery Stimulus controller injects this decoded value directly into an element's innerHTML property without applying any additional escaping or validation. Because innerHTML interprets the injected content as HTML and JavaScript code rather than plain text, any script tags or event handlers embedded within the filename are executed by the victim's browser upon loading the gallery view.
The operational impact of this vulnerability is severe due to the bypassing of Content-Security-Policy (CSP) protections. The application sends a global CSP header in report-only mode rather than enforcing it, which means that while violations might be logged for debugging purposes, they are not blocked by the browser's security engine. This configuration allows inline event handlers such as `onerror` to execute freely within the DOM-based injection context. Consequently, an attacker can craft a payload using standard XSS techniques like `<img src=x onerror=alert(1)>` or more sophisticated scripts designed to steal session cookies, hijack user sessions, perform actions on behalf of the victim, or redirect users to malicious phishing sites. Since the vulnerability affects public share links, it enables non-authenticated attackers to compromise any viewer who accesses a shared folder containing a file with a maliciously named attachment, facilitating credential theft and unauthorized access to sensitive workspace data.
To mitigate this risk, organizations must immediately upgrade Dobase to version 2026.06.03 or later where the issue has been resolved by implementing proper input validation and output encoding mechanisms within the Stimulus controller. In addition to upgrading, security teams should enforce strict Content-Security-Policy headers in enforcing mode rather than report-only mode to provide a defense-in-depth layer that would block inline script execution even if similar vulnerabilities exist elsewhere in the application. Furthermore, developers should adopt secure coding practices such as using textContent instead of innerHTML when injecting user data into the DOM and ensuring that all client-side JavaScript processing untrusted input applies appropriate escaping functions before rendering content to the browser. These measures align with industry standards like OWASP Top 10 recommendations for preventing XSS attacks through rigorous input validation, output encoding, and CSP implementation.