CVE-2026-48542 in laravel-crm
Summary
by MITRE • 09/24/2026
Krayin CRM through 2.2.6 contains a stored client-side template injection vulnerability that allows authenticated attackers to execute arbitrary JavaScript in other users' browsers by injecting Vue.js template expressions into the product name field. Attackers can craft a product name containing double-brace template syntax that reaches the Vue template compiler, enabling prototype chain traversal to retrieve the Function constructor and execute attacker-supplied JavaScript in the application origin for every user who views the affected product record.
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Analysis
by VulDB Data Team • 09/24/2026
The vulnerability identified in Krayin CRM versions up through 2.2.6 represents a critical security flaw rooted in improper neutralization of special elements used by an interpreter, specifically categorized under CWE-79 Improper Neutralization of Input During Web Page Generation known as Cross-Site Scripting. This particular instance manifests as a stored client-side template injection rather than traditional reflected XSS, which significantly escalates the severity and persistence of the threat. The core technical flaw lies in how the application processes user-supplied input within product name fields before rendering them via Vue.js templates. When an authenticated attacker injects specific double-brace syntax characteristic of Vue.js expressions into a product name, this malicious payload is stored directly in the database without adequate sanitization or encoding checks that would prevent it from being interpreted as executable template code rather than plain text data.
The operational impact of this vulnerability extends beyond simple script execution to include full arbitrary JavaScript execution within the context of the application's origin for every user who views the affected product record. Because the payload is stored server-side, it does not require social engineering tricks like phishing links to trigger; instead, any authenticated user accessing a page that displays the compromised product name will inadvertently execute the injected code in their browser environment. This persistence mechanism ensures that the attack vector remains active until the malicious data is manually removed from the database or the vulnerable template rendering logic is patched. The ability to reach the Function constructor through prototype chain traversal allows attackers to bypass many modern browser security restrictions, enabling them to perform actions such as stealing session cookies, hijacking user sessions, performing unauthorized administrative actions on behalf of victims, or exfiltrating sensitive data stored within the application's local storage or memory.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK technique T1059 Command and Scripting Interpreter under JavaScript execution, specifically leveraging client-side rendering engines to achieve code injection. The attack path involves initial access through valid authentication credentials followed by persistence via stored data manipulation and privilege escalation or impact through session hijacking and data theft. This scenario highlights the risks associated with modern single-page application frameworks where template syntax can be confused with dynamic content if input validation is not strictly enforced at both the client-side rendering layer and the server-side storage layer.
Mitigation strategies must focus on implementing strict output encoding and context-aware escaping for all user-supplied data before it is rendered by Vue.js templates. Developers should avoid using v-html or similar directives that render raw HTML or template expressions without proper sanitization libraries such as DOMPurify, although even these require careful configuration when dealing with dynamic frameworks like Vue. Additionally, implementing Content Security Policy headers can help mitigate the impact of successful injections by restricting script execution sources and preventing unauthorized data exfiltration. Input validation should be applied at multiple layers, ensuring that special characters are escaped or rejected before they reach the database storage mechanism. Regular security audits focusing on template injection patterns in modern JavaScript frameworks are essential to prevent similar vulnerabilities from being introduced during future development cycles.