CVE-2026-95682 in MISP
Summary
by MITRE • 09/22/2026
MISP contains a stored cross-site scripting (XSS) vulnerability in the admin email composition screen. The MISP.org organization name setting was interpolated directly into a JavaScript string literal using an unescaped PHP echo: var org = "<?php echo $org;?>";. Because the value was placed inside a double-quoted JavaScript string without any encoding, an organization name containing a double-quote character (or a backslash) could terminate the string literal and inject arbitrary JavaScript into the page. The injected script would execute in the context of any authenticated user who subsequently loads the admin email page, potentially allowing session hijacking, data exfiltration, or privileged actions performed on behalf of the victim.
Exploitation requires the ability to set or modify the MISP.org organization name and a second authenticated user visiting the affected admin email view.
The vulnerability is a classic instance of insufficient output encoding in a JavaScript context.
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Analysis
by VulDB Data Team • 09/22/2026
This vulnerability represents a critical stored cross-site scripting flaw within the Misp platform, specifically located in the administrative email composition interface. The root cause lies in how the system handles user-supplied input during server-side rendering. When an administrator configures or modifies the organization name setting for MISP.org, this value is directly interpolated into a JavaScript string literal using an unescaped PHP echo statement formatted as var org = "". This implementation fails to apply any form of encoding or sanitization before injecting the data into the client-side script context. Consequently, if the organization name contains special characters such as double quotes or backslashes, it can prematurely terminate the JavaScript string literal. This breakage allows an attacker to inject arbitrary JavaScript code that will be executed by the browser when the page is rendered.
The operational impact of this vulnerability is severe due to its stored nature and high-privilege context. Exploitation requires two distinct conditions: first, the ability for a user with sufficient privileges to set or modify the MISP.org organization name field, and second, another authenticated user must subsequently load the affected admin email view page. Once these conditions are met, any JavaScript injected via the maliciously crafted organization name will execute in the security context of the victim's session. This enables attackers to perform a wide range of malicious actions including session hijacking by stealing authentication cookies or tokens, data exfiltration where sensitive intelligence from the MISP instance is sent to an external server controlled by the attacker, and performing privileged actions on behalf of the victim without their knowledge or consent.
From a technical classification perspective, this flaw aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. More specifically, it falls under CWE-80 Basic XSS because the injection occurs through direct insertion into an HTML/JavaScript context without proper encoding. In terms of adversary behavior mapping to MITRE ATT&CK techniques, this vulnerability facilitates T1059 Command and Scripting Interpreter for executing arbitrary code within a browser environment and potentially T1539 Steal Web Session Cookie if session tokens are targeted. The lack of output encoding in the JavaScript context is the primary technical deficiency that allows the attack vector to succeed.
To mitigate this risk, immediate remediation steps should focus on enforcing strict input validation and robust output encoding. Developers must ensure that all dynamic data inserted into JavaScript string literals undergoes proper escaping for both HTML content and JavaScript contexts. Specifically, double quotes, single quotes, backslashes, and other control characters within the organization name field must be escaped before being embedded in the var org = "" statement. Implementing a Content Security Policy with strict script-src directives can also help mitigate the impact of any successfully injected scripts by restricting where code can execute from. Additionally, applying principle of least privilege to ensure that only highly trusted administrators have access to modify global organization settings reduces the attack surface for this specific vulnerability vector.