Description

Unauthenticated Cross Site Scripting (XSS) in SUMO Affiliates Pro <= 11.7.0 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-10-06T09:17:43.150Z",
  "pubdate": "2026-10-06T09:17:43.150Z",
  "executiveSummary": "SUMO Affiliates Pro versions 11.7.0 and below are susceptible to an unauthenticated Cross-Site Scripting (XSS) vulnerability. This flaw arises from the improper sanitization and validation of user-supplied input before rendering it within the web browser.\nThe vulnerability allows remote, unauthenticated attackers to inject arbitrary malicious scripts, such as JavaScript, into the context of victim sessions. When an unsuspecting user, such as an administrator or affiliate member, interacts with the compromised page, the browser executes the malicious payload.\nThe impact of this vulnerability is severe, potentially resulting in unauthorized session hijacking, theft of sensitive information (including cookies and authentication tokens), and unauthorized modifications to the affiliate program settings. By leveraging this XSS vector, an attacker can bypass traditional authentication mechanisms and perform actions on behalf of the user, leading to a complete compromise of the affected affiliate dashboard.\nGiven that this vulnerability does not require authentication, it represents a high-risk entry point for malicious actors. Security teams are urged to restrict access to affected modules or apply vendor-provided patches as soon as they become available to mitigate the risk of exploitation.",
  "technicalDetails": "The vulnerability resides in the input handling mechanisms of SUMO Affiliates Pro <= 11.7.0. It occurs because the application fails to adequately sanitize input parameters processed during requests, allowing for the injection of executable HTML or JavaScript content. This is a classic reflection-based XSS scenario where the input provided by an unauthenticated user is reflected back to the browser without being properly encoded for the output context.\nThe root cause is the lack of robust input validation and output encoding on specific endpoints within the plugin. When an attacker submits a crafted HTTP request containing malicious payload strings to a vulnerable parameter, the application embeds these strings directly into the HTML response. Because the application does not properly escape or sanitize these inputs before rendering them, the browser interprets the input as code rather than literal text.\nThe attack flow proceeds as follows: An attacker identifies a reflected or stored parameter that is processed by the plugin without server-side sanitization. The attacker constructs a malicious payload—typically a script tag or an event-based trigger such as 'onerror' or 'onload'—and injects it into the vulnerable input field. This payload is then submitted to the server. Upon the subsequent rendering of the page, the server returns a response containing the injected script. The victim's browser, upon receiving the response, executes the script in the context of the user's session.\nThe exploitation does not require the attacker to have an active session or elevated privileges, making it accessible from a public network. The impact is primarily client-side; however, in the context of an administrative dashboard, the malicious script can be used to capture session identifiers, forge CSRF tokens, or perform unauthorized administrative actions such as creating new affiliate accounts or modifying payment configurations. The script operates within the same-origin policy domain of the web application, granting the attacker access to cookies, local storage, and other sensitive browser-resident data belonging to the site.\nBecause the payload is reflected, the attacker may also use social engineering to distribute the malicious link to legitimate users, effectively weaponizing the site against its own authorized personnel to escalate privileges or exfiltrate sensitive data."
}