CVE-2025-71246 in SPIP
Summary
by MITRE • 02/19/2026
SPIP before 4.4.8 allows Cross-Site Scripting (XSS) in the public area for certain edge-case usage patterns. The echapper_html_suspect() function does not adequately detect all forms of malicious content, permitting an attacker to inject scripts that execute in a visitor's browser. This vulnerability is not mitigated by the SPIP security screen.
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Analysis
by VulDB Data Team • 02/19/2026
The vulnerability identified as CVE-2025-71246 represents a critical cross-site scripting flaw within the SPIP content management system affecting versions prior to 4.4.8. This security weakness resides in the public-facing components of the platform where users can interact with the system without authentication, creating an attack surface that malicious actors can exploit to compromise visitor browsers. The vulnerability specifically targets the echapper_html_suspect() function which serves as a critical security mechanism designed to sanitize user input and prevent malicious script execution. However, this function fails to comprehensively identify all potential forms of malicious content that could be embedded within user-submitted data, creating a gap in the system's defensive capabilities that attackers can leverage.
The technical implementation of this vulnerability stems from insufficient input validation within the echapper_html_suspect() function which is responsible for HTML sanitization in SPIP's security framework. This function is designed to detect and neutralize potentially dangerous content that could enable XSS attacks, yet it contains logic flaws that allow certain edge-case scenarios to bypass the sanitization process. Attackers can craft malicious payloads that exploit these specific edge cases where the function's detection algorithms fail to identify the threat, enabling script injection that executes within the context of a victim's browser session. The vulnerability is particularly concerning because it affects the public area of the system, meaning that any visitor to the website could be exposed to malicious scripts without requiring authentication or privileged access.
The operational impact of this vulnerability extends beyond simple script execution as it creates a persistent threat vector that can be exploited for various malicious activities. Visitors who encounter the malicious content may experience session hijacking, credential theft, or redirection to malicious websites. The vulnerability's persistence in the public area means that legitimate website visitors become unwitting participants in the attack chain, potentially leading to widespread compromise across the user base. Furthermore, since the vulnerability remains unmitigated by SPIP's existing security screen, the system's built-in defenses fail to provide protection against this specific attack pattern, leaving websites running affected versions vulnerable to exploitation. This creates a significant risk for organizations relying on SPIP for content management, as the attack surface includes not only the direct users but also any third-party integrations or automated systems that may interact with the public-facing components.
Security professionals should implement immediate mitigation strategies including upgrading to SPIP version 4.4.8 or later, which contains the patched echapper_html_suspect() function with enhanced detection capabilities. Organizations should also consider implementing additional security layers such as content security policies and web application firewalls to provide defense-in-depth against similar vulnerabilities. The vulnerability aligns with CWE-79 which categorizes cross-site scripting flaws, and represents a specific implementation weakness that could be addressed through proper input validation and sanitization techniques. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control communications and credential access, as attackers can leverage the XSS to establish persistent access to user sessions. The remediation process should include comprehensive testing of the updated sanitization functions to ensure that all potential edge cases have been properly addressed and that the security screen functions as intended.