CVE-2018-17784 in Community Edition
Summary
by MITRE
Multiple vulnerabilities in YUI and FlashCanvas embedded in SugarCRM Community Edition 6.5.26 could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack on a targeted system.
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Analysis
by VulDB Data Team • 08/07/2025
The vulnerability identified as CVE-2018-17784 affects SugarCRM Community Edition version 6.5.26 and encompasses multiple cross-site scripting flaws within the YUI library and FlashCanvas components that are embedded within the application. This issue represents a critical security weakness that enables unauthenticated remote attackers to execute malicious scripts against unsuspecting users who interact with the vulnerable system. The affected components leverage the YUI JavaScript library and FlashCanvas functionality to render graphical elements and user interface components, creating multiple attack vectors that could be exploited without requiring any authentication credentials from the attacker. These embedded libraries are commonly used for enhancing user experience and providing advanced graphical capabilities within web applications, but in this case they introduce significant security risks that can be leveraged for malicious purposes.
The technical flaw manifests through improper input validation and output encoding mechanisms within the YUI and FlashCanvas components that are integrated into SugarCRM's user interface. When user-supplied data is processed by these libraries, insufficient sanitization occurs, allowing malicious script code to be injected and subsequently executed within the context of the victim's browser session. This vulnerability specifically targets the way the application handles user input when rendering graphical elements through FlashCanvas and the JavaScript functionality provided by YUI, creating opportunities for attackers to inject malicious payloads that can persist across user sessions. The flaw falls under CWE-79 which defines Cross-Site Scripting as a weakness where applications fail to properly validate or encode user-supplied input before rendering it in web pages, making it a classic example of insecure data handling in web applications.
The operational impact of CVE-2018-17784 extends beyond simple script injection, as it provides attackers with the ability to perform session hijacking, data theft, and further exploitation of the compromised system. An attacker could leverage this vulnerability to steal user credentials, access sensitive customer data, modify records within the CRM system, or redirect users to malicious websites. The unauthenticated nature of the attack means that any user interacting with the vulnerable SugarCRM instance could be targeted, potentially affecting thousands of users depending on the deployment size. The vulnerability could also serve as a launching point for more sophisticated attacks, as successful XSS exploitation often enables attackers to establish persistent access to the system or escalate privileges within the application environment. Organizations using this version of SugarCRM face significant risk of data breaches and unauthorized access to their customer relationship management systems.
Mitigation strategies for CVE-2018-17784 should focus on immediate patching of the affected SugarCRM version to the latest available release that addresses these vulnerabilities in the embedded YUI and FlashCanvas components. Organizations should also implement comprehensive input validation and output encoding mechanisms throughout their web applications to prevent similar issues from occurring in the future. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, though they should not be relied upon as the sole mitigation strategy. Security teams should conduct thorough vulnerability assessments of all embedded libraries and components within their applications, particularly those that handle user input or generate dynamic content. The ATT&CK framework categorizes this type of vulnerability under the T1059 technique for command and control through scripting, as attackers can use XSS vulnerabilities to establish persistent access and execute malicious code within user browsers. Regular security monitoring and user education about suspicious website behavior should also be implemented to detect and prevent exploitation attempts. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts and reduce the impact of potential XSS attacks.