CVE-2017-5488 in WordPress
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in wp-admin/update-core.php in WordPress before 4.7.1 allow remote attackers to inject arbitrary web script or HTML via the (1) name or (2) version header of a plugin.
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Analysis
by VulDB Data Team • 05/13/2026
The vulnerability identified as CVE-2017-5488 represents a critical cross-site scripting flaw within the WordPress content management system affecting versions prior to 4.7.1. This issue resides in the wp-admin/update-core.php file which handles core update operations and plugin management functions. The vulnerability specifically targets the handling of plugin metadata during update processes, creating a pathway for remote attackers to execute malicious scripts within the context of authenticated admin sessions. The flaw manifests when the system fails to properly sanitize or escape user-supplied data from plugin headers, particularly the name and version fields that are typically displayed during update operations.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding practices within WordPress's update core functionality. When administrators navigate to the update core interface, the system retrieves plugin information including header data that may contain malicious payloads. The absence of proper sanitization mechanisms means that attackers can craft plugin headers containing script tags or other malicious HTML content that gets executed when the admin interface displays this information. This represents a classic reflected cross-site scripting vulnerability where the malicious code is injected through the application's own data processing rather than being stored. The vulnerability operates under CWE-79 which categorizes improper neutralization of input during web page generation, specifically addressing the failure to properly encode output to prevent script execution.
The operational impact of CVE-2017-5488 extends beyond simple script injection as it provides attackers with potential access to administrative privileges and complete control over WordPress installations. An attacker who successfully exploits this vulnerability can execute arbitrary code within the context of the administrator's browser session, potentially leading to full system compromise. The attack vector requires minimal privileges since it targets the admin interface where legitimate users already possess elevated permissions. This makes the vulnerability particularly dangerous in environments where administrators frequently update plugins or view update notifications. The vulnerability aligns with ATT&CK technique T1059.007 which covers scripting languages including JavaScript execution, and T1078 which addresses valid accounts and privilege escalation through compromised administrative access.
Mitigation strategies for CVE-2017-5488 require immediate implementation of the official WordPress security patch version 4.7.1 which addresses the sanitization issues in the update-core.php file. Organizations should also implement additional defensive measures including regular security audits of plugin installations, monitoring for unauthorized plugin modifications, and implementing content security policies to limit script execution. Network-level protections such as web application firewalls can provide additional layers of defense by filtering suspicious header data before it reaches the vulnerable application. Administrators should conduct regular security training to recognize potentially malicious plugin updates and maintain updated security baselines for all WordPress installations. The vulnerability serves as a reminder of the critical importance of keeping CMS platforms updated and maintaining proper input validation practices throughout all application components.