CVE-2007-1433 in Blog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Grayscale Blog 0.8.0, and possibly earlier versions, allows remote attackers to inject arbitrary web script or HTML via the comment fields to (1) scripts/addblog_comment.php and (2) detail.php.
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Analysis
by VulDB Data Team • 09/06/2025
The vulnerability identified as CVE-2007-1433 represents a critical cross-site scripting flaw in the Grayscale Blog content management system version 0.8.0 and potentially earlier releases. This security weakness resides in the application's handling of user input within comment submission mechanisms, specifically affecting two key script files that process blog comments and display detailed entries. The flaw enables malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers, creating a significant vector for various attack scenarios including session hijacking, data theft, and malicious content distribution.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the comment processing scripts. When users submit comments through the addblog_comment.php endpoint or when viewing detailed blog entries via detail.php, the application fails to properly sanitize or escape user-supplied data before rendering it in the web page context. This inadequate sanitization allows attackers to inject malicious payloads that are subsequently executed by unsuspecting visitors who view the compromised content. The vulnerability specifically targets the comment fields, which are typically designed to accept user-generated content without sufficient security controls to prevent code injection attacks.
The operational impact of this XSS vulnerability extends beyond simple script execution, as it provides attackers with the ability to manipulate the entire user experience on the affected blog platform. An attacker could inject malicious scripts that steal session cookies, redirect users to phishing sites, modify page content, or even perform actions on behalf of authenticated users. The attack surface is particularly concerning given that blog comment systems are often designed to be accessible to all users, including those who may not be authenticated, making the vulnerability exploitable by anyone with access to the blog's comment submission functionality. This creates a persistent threat vector that can affect all users who interact with the compromised content.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms throughout the application's comment handling processes. The recommended approach involves sanitizing all user input before processing and ensuring that any content rendered in web pages undergoes proper HTML encoding to prevent script execution. Organizations should implement the principle of least privilege by validating and filtering all comment submissions against a strict whitelist of allowed characters and content types. Additionally, the application should employ proper content security policies and implement proper output encoding techniques to neutralize malicious payloads. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws, and represents a classic example of how insufficient input validation can create persistent security weaknesses in web applications. The attack pattern associated with this vulnerability maps to ATT&CK technique T1566, specifically targeting credential access through malicious content injection, making it a critical concern for organizations maintaining web-based content platforms.