CVE-2026-29100 in SuiteCRM
Summary
by MITRE • 03/20/2026
SuiteCRM is an open-source, enterprise-ready Customer Relationship Management (CRM) software application. SuiteCRM 7.15.0 contains a reflected HTML injection vulnerability in the login page that allows attackers to inject arbitrary HTML content, enabling phishing attacks and page defacement. Version 7.15.1 patches the issue.
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Analysis
by VulDB Data Team • 03/25/2026
The vulnerability CVE-2026-29100 represents a reflected HTML injection flaw within SuiteCRM 7.15.0's login page interface, constituting a critical security weakness that directly impacts the software's authentication mechanism. This issue arises from insufficient input validation and output encoding practices within the web application's user interface components, specifically affecting the login form's handling of user-supplied parameters. The vulnerability manifests when the application fails to properly sanitize or escape user-provided data before incorporating it into HTML responses, creating an avenue for malicious actors to inject arbitrary HTML content. The affected version 7.15.0 demonstrates a clear failure in implementing proper security controls around user input processing, particularly in authentication contexts where trust and data integrity are paramount.
The technical exploitation of this vulnerability occurs through the injection of malicious HTML content into the login page response, enabling attackers to manipulate the user interface in ways that can compromise user security. When users interact with the vulnerable login page, any malicious HTML code embedded in input fields or URL parameters gets reflected back to the user's browser, allowing for various attack vectors including phishing page mimicry, session hijacking, and credential theft. The reflected nature of this injection means that the malicious payload is immediately executed in the victim's browser context without requiring persistent storage or complex attack chains. This vulnerability directly aligns with CWE-79 which defines Cross-Site Scripting (XSS) conditions where untrusted data is incorporated into web pages without proper validation or escaping, making it particularly dangerous in authentication contexts where users are already trusting the application interface.
The operational impact of this vulnerability extends beyond simple page defacement to encompass significant security risks for SuiteCRM deployments, particularly in enterprise environments where sensitive customer data and business operations are managed through the CRM system. Attackers can leverage this vulnerability to create convincing phishing pages that mimic legitimate login interfaces, potentially capturing user credentials and gaining unauthorized access to customer relationship management systems. The vulnerability's presence in the login page creates a particularly dangerous attack surface since it targets users during their most trusted interaction with the application. Organizations running SuiteCRM 7.15.0 face elevated risk of credential compromise, data breaches, and potential lateral movement within their networks if attackers successfully exploit this vulnerability. The impact is amplified in environments where SuiteCRM handles sensitive personal data, financial information, or proprietary business intelligence, making the vulnerability particularly concerning for compliance and regulatory requirements.
The remediation for CVE-2026-29100 requires immediate deployment of SuiteCRM version 7.15.1, which implements proper input validation and output encoding mechanisms to prevent HTML injection attacks. Organizations should conduct comprehensive vulnerability assessments to identify any other potentially affected versions of SuiteCRM and ensure all instances are updated to the patched release. Security teams should implement additional monitoring for suspicious login page interactions and user behavior patterns that might indicate exploitation attempts. The fix addresses the root cause by ensuring that all user-supplied input is properly sanitized before being rendered in HTML contexts, following established security practices for preventing XSS vulnerabilities. Organizations should also consider implementing additional security controls such as Content Security Policy headers and regular security testing to prevent similar vulnerabilities from emerging in other components of their SuiteCRM deployments. This vulnerability demonstrates the critical importance of maintaining up-to-date software versions and implementing robust input validation practices as outlined in the ATT&CK framework's defensive techniques for preventing web-based attacks through proper application security controls and input sanitization measures.