CVE-2026-111037 in Total Spend Management Platform
Summary
by MITRE • 11/04/2026
A reflected Cross-Site Scripting (XSS) vulnerability in the Tenders module of the Coupa Supplier Portal SaaS platform. The vulnerability arises because the `list_item_function` parameter is reflected in the server’s response without proper output encoding or sanitisation, and is directly embedded within the context of a JavaScript event handler. An attacker with a low-privileged account could create a malicious URL containing JavaScript payloads which, when opened by a victim, would execute arbitrary scripts within the context of the victim’s browser. A successful exploit could allow the attacker to perform actions on the victim’s behalf, disclose accessible information or manipulate the user interface.
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Analysis
by VulDB Data Team • 11/04/2026
The Coupa Supplier Portal SaaS platform contains a reflected Cross-Site Scripting vulnerability within its Tenders module, specifically triggered by improper handling of the list_item_function parameter. This security flaw stems from a failure to implement adequate output encoding or sanitization mechanisms for user-supplied input before it is returned in the server response. Because the vulnerable parameter is directly embedded into the context of a JavaScript event handler without validation, any content injected via this vector is interpreted as executable code by the victim's browser rather than being treated as inert data. This architectural oversight allows malicious scripts to bypass standard security controls that typically mitigate script injection attacks when input is properly escaped or encoded according to the specific execution context.
An attacker with a low-privileged account can exploit this weakness by crafting a specially constructed URL containing JavaScript payloads within the list_item_function parameter. When an authenticated victim, such as another supplier user or administrator, opens this malicious link while logged into their Coupa session, the browser parses and executes the injected script in the security context of the application domain. This execution environment grants the attacker significant leverage over the victim's interactive state, enabling them to perform actions on behalf of the user without authorization. The ability to execute arbitrary scripts within the trusted origin allows for sophisticated attacks that can manipulate the user interface, alter page content dynamically, or interact with other components of the web application as if they were part of the original legitimate codebase.
The operational impact of this vulnerability is substantial due to its potential for data exfiltration and session hijacking. By executing arbitrary JavaScript, an attacker can access sensitive information stored in local storage, cookies, or DOM elements that contain confidential business data related to tenders and supplier interactions. Furthermore, the attacker can manipulate form submissions to initiate unauthorized transactions, modify tender details, or send malicious requests to internal APIs using the victim's valid authentication credentials. This capability effectively compromises the integrity of the platform for targeted users and undermines trust in the SaaS environment by allowing low-privileged actors to escalate their influence through social engineering tactics that rely on victims clicking compromised links.
From a classification perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism where input is reflected in the response and executed within an event handler context corresponds to Reflected XSS patterns often documented under ATT&CK technique T1059 Command and Scripting Interpreter, particularly when used for client-side script execution. Mitigation strategies must focus on implementing strict output encoding tailored to the JavaScript context, ensuring that special characters are escaped before being rendered in HTML attributes or event handlers. Additionally, deploying Content Security Policy headers can provide a robust defense-in-depth layer by restricting the sources from which scripts are allowed to execute, thereby limiting the impact even if an injection attempt succeeds. Input validation should also be enforced on both client and server sides to reject unexpected characters or patterns that do not conform to expected business logic for the list_item_function parameter.