CVE-2023-29643 in PerfreeBlog
Summary
by MITRE • 05/01/2023
Cross Site Scripting (XSS) vulnerability in PerfreeBlog 3.1.2 allows attackers to execute arbitrary code via the Post function.
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Analysis
by VulDB Data Team • 12/11/2025
The vulnerability identified as CVE-2023-29643 represents a critical cross site scripting flaw in PerfreeBlog version 3.1.2 that exposes the application to remote code execution attacks through the Post function. This vulnerability falls under the Common Weakness Enumeration category CWE-79 which specifically addresses Cross Site Scripting flaws where untrusted data is improperly integrated into web pages viewed by other users. The flaw enables attackers to inject malicious scripts into the application's content handling mechanism, creating a persistent threat vector that can compromise user sessions and data integrity.
The technical implementation of this vulnerability occurs when the Post function fails to properly sanitize or validate user input before rendering it within the web application's output. Attackers can craft malicious payloads that, when processed through the Post function, get executed in the browsers of other users who view the affected content. This typically involves injecting javascript code or other malicious script elements that can hijack user sessions, redirect traffic, or perform unauthorized actions on behalf of victims. The vulnerability exists due to inadequate input validation and output encoding mechanisms within the application's content processing pipeline.
The operational impact of CVE-2023-29643 extends beyond simple script injection as it provides attackers with a foothold for more sophisticated attacks within the target environment. Once an attacker successfully exploits this vulnerability, they can establish persistent access through session hijacking, data exfiltration, or by using the compromised system as a launch point for further attacks. The attack surface is particularly concerning given that the vulnerability affects the core posting functionality, which means that any user with posting privileges can become a vector for exploitation. This creates a scenario where even legitimate users could unknowingly become conduits for malicious activity, making detection and containment more challenging.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data flow. The recommended approach includes implementing strict sanitization of all user input before processing, utilizing proper context-specific output encoding for different data types, and implementing Content Security Policy headers to limit script execution. Additionally, developers should adopt secure coding practices that align with OWASP Top Ten recommendations and follow the principle of least privilege for user permissions. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities, while implementing web application firewalls can provide an additional layer of protection against known attack patterns. The vulnerability also highlights the importance of keeping software components up to date and following security patch management procedures to prevent exploitation of known weaknesses.