CVE-2025-26754 in Timeline Block Plugin
Summary
by MITRE • 02/17/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bPlugins Timeline Block allows Stored XSS. This issue affects Timeline Block: from n/a through 1.1.1.
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Analysis
by VulDB Data Team • 02/17/2025
The vulnerability identified as CVE-2025-26754 represents a critical cross-site scripting weakness within the bPlugins Timeline Block plugin, specifically impacting versions ranging from an unspecified initial state through version 1.1.1. This flaw resides in the improper neutralization of input during web page generation processes, creating a persistent security risk that enables attackers to execute malicious scripts in the context of affected users' browsers. The vulnerability falls under the well-established CWE-79 category, which classifies cross-site scripting flaws as a fundamental weakness in web application security. The issue manifests as a stored XSS vulnerability, meaning that malicious payloads can be permanently stored on the server and subsequently executed whenever affected pages are accessed by other users, making this particularly dangerous for content management systems where user-generated content is prevalent.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization mechanisms within the Timeline Block plugin's codebase. When users submit data through the plugin's interface, particularly for timeline events or related content fields, the application fails to properly sanitize or escape potentially malicious input before rendering it in HTML output. This inadequate processing creates an environment where attackers can inject script code that gets stored in the database and executed whenever the timeline content is displayed. The vulnerability's impact extends beyond simple script execution to potentially enable session hijacking, credential theft, and full compromise of user sessions. According to ATT&CK framework category T1190, this vulnerability represents a technique for exploiting web applications through client-side code injection, which can lead to broader compromise of the web application environment and user systems.
The operational implications of CVE-2025-26754 are severe for WordPress environments utilizing the affected bPlugins Timeline Block plugin, as it creates a persistent backdoor for attackers to maintain access and execute malicious activities. Attackers can craft payloads that exploit the stored nature of this XSS vulnerability to inject malicious JavaScript code into timeline entries, which then executes against all users who view the timeline page. This stored nature means that the attack persists even after the initial injection, making it particularly insidious for administrators and content creators who may not immediately detect the compromise. The vulnerability's scope encompasses any user interaction with timeline content generation or viewing functionality, potentially affecting website administrators, contributors, and end-users who access timeline displays. Organizations running affected versions should consider this vulnerability as a high-priority threat requiring immediate remediation, as it can lead to complete compromise of user sessions and potential data exfiltration from the affected web applications.
Mitigation strategies for CVE-2025-26754 should prioritize immediate version updates to the bPlugins Timeline Block plugin, ensuring that all instances are upgraded to versions that address the XSS vulnerability. System administrators should implement comprehensive input validation and output encoding mechanisms to prevent similar issues in the future, particularly focusing on sanitizing all user-provided content before storage and rendering. Network monitoring solutions should be enhanced to detect potential exploitation attempts through anomalous script injection patterns, while web application firewalls can provide additional protection layers against known XSS attack vectors. The remediation process should also include thorough security auditing of all plugins and themes to identify similar input validation weaknesses, with regular security assessments to maintain protection against evolving attack techniques. Organizations should also implement proper access controls and user session management to limit the potential impact of successful exploitation attempts, ensuring that even if XSS occurs, the attacker's capabilities remain constrained through proper privilege management.