CVE-2026-106707 in XXL-JOB
Summary
by MITRE • 10/15/2026
XXL-JOB <=3.5.0-SNAPSHOT contains a stored Cross-Site Scripting (XSS) vulnerability in the job log list page (/joblog). An authenticated user who holds permission on a target executor job group can inject arbitrary JavaScript via the executorParam argument of the manual-trigger endpoint POST /jobinfo/trigger.
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Analysis
by VulDB Data Team • 10/15/2026
The identified security flaw resides within XXL-JOB versions up to 3.5.0-SNAPSHOT, specifically affecting the handling of user-supplied input in the job log list interface and the execution parameters for scheduled tasks. This vulnerability is classified as a stored Cross-Site Scripting issue, which represents a significant risk to web application security by allowing attackers to inject malicious client-side scripts into pages viewed by other users or administrators. The core technical deficiency lies in the insufficient sanitization of the executorParam argument when it is processed through the manual-trigger endpoint located at POST /jobinfo/trigger. When an authenticated user with permissions on a specific executor job group submits this parameter, the application fails to properly validate or encode the input before storing it for later retrieval and display within the job log list page accessible via /joblog.
From a technical perspective, the vulnerability exploits the lack of output encoding when rendering data that was previously accepted as input without adequate filtering. The attacker crafts a malicious payload containing JavaScript code and submits it through the trigger endpoint by populating the executorParam field with this content. Because the application stores this parameter to maintain logs or execution context for auditing purposes, the injected script becomes persistent within the system's database or log files. Subsequently, when an authorized user navigates to the job log list page to review past executions, the browser interprets and executes the embedded JavaScript in the context of the vulnerable web application domain. This persistence distinguishes stored XSS from reflected variants, as the malicious code does not need to be triggered by a single link but remains active until removed or expired within the system logs.
The operational impact of this vulnerability is severe due to its potential for widespread exploitation and data compromise. An attacker can leverage the executed JavaScript to perform session hijacking by stealing authentication cookies or tokens, thereby gaining unauthorized access to other users' accounts with elevated privileges if those users have administrative rights. Furthermore, the malicious script can facilitate keylogging activities, capturing sensitive information such as credentials entered into the application interface. It may also redirect victims to phishing sites designed to harvest additional personal data or deploy further malware onto client systems through drive-by downloads. The ability to execute arbitrary code in the context of the trusted domain effectively bypasses same-origin policy protections, allowing the attacker to interact with the application's Document Object Model and perform actions on behalf of legitimate users without their knowledge or consent.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. Additionally, in terms of tactical mapping within the MITRE ATT&CK framework for enterprise security, this flaw supports techniques associated with Collection and Credential Access, specifically under vectors that involve browser-based attacks or phishing where stored scripts are used to harvest credentials from unsuspecting administrators reviewing system logs. The persistence mechanism ensures that even if initial access is limited, the attacker can maintain influence over the application environment by waiting for high-privilege users to view compromised log entries.
To mitigate this risk, immediate remediation actions should focus on implementing robust input validation and output encoding strategies across all data handling pathways within XXL-JOB. Developers must ensure that any user-controllable data, particularly parameters like executorParam used in job execution contexts, is strictly validated against a whitelist of expected formats before storage. More critically, when rendering this data back to the client via HTML pages such as /joblog, it must be properly encoded using context-aware output encoding techniques appropriate for HTML body content or JavaScript strings depending on where the value appears. Upgrading to patched versions of XXL-JOB that address these sanitization gaps is essential. In environments where upgrading is not immediately feasible, deploying a Web Application Firewall can provide an additional layer of defense by detecting and blocking requests containing known XSS payload patterns in POST parameters before they reach the application logic. Regular security audits focusing on input-output data flows are recommended to prevent similar injection flaws from being introduced during future development cycles.