CVE-2026-116555 in Argilla
Summary
by MITRE • 10/27/2026
A vulnerability has been found in Argilla up to 2.8.0. The impacted element is an unknown function of the file argilla-frontend/components/features/annotation/container/fields/sandbox/Sandbox.vue. The manipulation of the argument template leads to cross site scripting. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability identified in Argilla versions up to 2.8.0 represents a significant security risk within its frontend architecture, specifically targeting the annotation interface components. This flaw resides within the Sandbox.vue file located at argilla-frontend/components/features/annotation/container/fields/sandbox/Sandbox.vue and is classified as an arbitrary code execution vulnerability manifesting through cross-site scripting mechanisms. The core technical issue stems from improper validation or sanitization of user-supplied input passed to a template argument, allowing attackers to inject malicious scripts that are subsequently executed in the context of the victim's browser session. This type of flaw aligns with CWE-79, which covers Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting or XSS. The presence of this vulnerability indicates a failure in implementing robust input validation strategies for dynamic content rendering within Vue.js components, where untrusted data is directly interpolated into the DOM without adequate escaping or sanitization procedures.
From an operational perspective, the impact of this cross-site scripting vulnerability extends beyond mere script execution to include severe compromises of user confidentiality and integrity. Since remote exploitation is possible, any authenticated user interacting with the annotation features can be targeted by a malicious actor who crafts a specially designed payload embedded within the template argument. Once executed, these scripts have access to sensitive session cookies, local storage data, and potentially other protected resources associated with the Argilla platform. Attackers can leverage this capability to perform actions on behalf of the victim, such as stealing authentication tokens, redirecting users to phishing sites, or defacing the application interface. The ability to execute arbitrary JavaScript code effectively bypasses same-origin policy restrictions, granting the attacker full control over the client-side environment and potentially facilitating further attacks against backend systems if session hijacking occurs.
The ATT&CK framework categorizes this behavior under techniques related to Client-Side Scripting Injection, specifically aligning with T1059 which covers Command and Scripting Interpreter execution via browser-based vectors. The fact that an exploit has been disclosed publicly means that automated scanning tools and malicious actors can readily utilize known proof-of-concept code to identify and compromise vulnerable instances of Argilla. This public disclosure significantly lowers the barrier for entry, increasing the likelihood of widespread exploitation across organizations deploying this software without immediate patches or workarounds. The lack of response from the project maintainers despite early notification through issue reports exacerbates the risk landscape, leaving users exposed during a critical window where mitigation strategies must be manually implemented by system administrators and developers.
To mitigate these risks in the absence of an official patch, organizations should implement strict input validation rules on any data flowing into the Sandbox.vue component's template arguments. Developers can enforce output encoding to ensure that special characters are properly escaped before being rendered in the DOM, thereby neutralizing potential script injection attempts. Additionally, deploying a Web Application Firewall with specific rulesets designed to detect and block XSS payloads can provide an additional layer of defense at the network perimeter. It is also advisable to review all custom components within the Argilla frontend for similar patterns of unsafe template usage and apply Content Security Policy headers that restrict inline script execution where possible. Until a formal update is released, continuous monitoring of application logs for anomalous activity related to annotation features is recommended to detect potential exploitation attempts in real-time.