CVE-2023-27711 in Typecho
Summary
by MITRE • 03/16/2023
Cross Site Scripting vulnerability found in Typecho v.1.2.0 allows a remote attacker to execute arbitrary code via the Comment Manager /admin/manage-comments.php component.
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Analysis
by VulDB Data Team • 11/21/2025
The CVE-2023-27711 vulnerability represents a critical cross site scripting flaw in Typecho version 1.2.0 that exposes the Comment Manager component at /admin/manage-comments.php to remote code execution attacks. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the administrative interface of the popular PHP-based blogging platform. The flaw enables attackers to inject malicious scripts into comment fields that are then executed in the context of other users' browsers when they view the compromised comments. The vulnerability exists due to insufficient input validation and output encoding mechanisms within the comment management interface, allowing malicious payloads to bypass security controls and persist within the application's comment database.
The operational impact of this vulnerability extends beyond simple XSS exploitation as it creates a persistent threat vector that can be leveraged for more sophisticated attacks. Attackers can craft malicious comment payloads that execute scripts in the browser of administrators or other authenticated users who view the compromised comments. This opens the door to session hijacking, credential theft, and potential privilege escalation within the Typecho application. The vulnerability is particularly dangerous because the Comment Manager component is frequently accessed by administrators, making it an attractive target for attackers seeking to gain elevated privileges. The persistence of the vulnerability means that once exploited, malicious scripts can continue to execute against users who encounter the compromised comments, creating a long-term threat vector that can be difficult to detect and remediate.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically under the T1566 technique for Phishing and T1059 for Command and Scripting Interpreter. The attack chain typically begins with an attacker submitting malicious payloads through comment forms, which are then rendered in the administrative interface. The vulnerability demonstrates the importance of implementing proper input sanitization and output encoding practices as outlined in the OWASP Top Ten security principles. Organizations running Typecho 1.2.0 should immediately implement mitigations including input validation for comment fields, output encoding of all user-supplied content, and regular security auditing of administrative components. The recommended remediation involves updating to a patched version of Typecho, implementing web application firewalls to filter malicious payloads, and conducting thorough security reviews of all user input handling mechanisms within the application. Additionally, administrators should consider implementing content security policies to prevent execution of unauthorized scripts and monitor comment submission activities for suspicious patterns that may indicate exploitation attempts.