CVE-2024-27123 in QcalAgent
Summary
by MITRE • 09/18/2026
A cross-site scripting (XSS) vulnerability has been reported to affect QcalAgent. The local attackers can then exploit the vulnerability to bypass security mechanisms or read application data.
We have already fixed the vulnerability in the following version: QcalAgent 1.1.9 and later
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Analysis
by VulDB Data Team • 09/18/2026
The identified cross-site scripting vulnerability within QcalAgent represents a significant web security flaw that allows local attackers to inject malicious scripts into pages viewed by other users or potentially access sensitive application data directly through client-side execution environments. This type of vulnerability typically arises when an application includes untrusted data in its output without proper validation, encoding, or escaping mechanisms in place. In the context of QcalAgent, this failure likely occurs during the processing of user-supplied input that is subsequently rendered by a web browser without adequate sanitization, thereby violating fundamental principles of secure coding practices designed to prevent script injection attacks.
From a technical perspective, cross-site scripting vulnerabilities are categorized under CWE-79 in the Common Weakness Enumeration framework, which specifically addresses Improper Neutralization of Input During Web Page Generation. The operational impact of such a flaw is severe because it enables attackers to execute arbitrary JavaScript code within the security context of the vulnerable application. This capability allows malicious actors to bypass standard browser same-origin policies, potentially stealing session cookies, authentication tokens, or other sensitive information stored in local storage or cookies associated with the QcalAgent domain. Furthermore, these scripts can manipulate the DOM structure of the affected page, leading to defacement or redirection attacks that compromise user trust and data integrity.
The exploitation vector for this vulnerability aligns with several techniques documented in the MITRE ATT&CK framework, particularly those related to client-side code injection and credential harvesting. Attackers may craft malicious links or payloads that trigger when a victim interacts with compromised content within QcalAgent. Once executed, the injected script can perform actions on behalf of the user without their knowledge, such as sending requests to external servers containing stolen credentials or session identifiers. This undermines the confidentiality and integrity guarantees expected from secure web applications and poses a direct risk to users relying on QcalAgent for legitimate operations.
To mitigate this vulnerability effectively, it is imperative that all software versions prior to 1.1.9 are upgraded immediately to version 1.1.9 or later, where the issue has been resolved by developers through improved input validation and output encoding strategies. Organizations should also implement Content Security Policy headers to restrict the sources from which scripts can be loaded, adding an additional layer of defense against script injection even if similar vulnerabilities exist in other components. Regular security audits and static code analysis tools configured to detect XSS patterns are recommended to identify and remediate such flaws early in the development lifecycle, ensuring that future releases maintain robust protection against client-side attacks.