CVE-2014-5144 in Telescope
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Telescope before 0.9.3 allows remote authenticated users to inject arbitrary web script or HTML via crafted markdown.
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Analysis
by VulDB Data Team • 05/25/2025
The CVE-2014-5144 vulnerability represents a critical cross-site scripting flaw discovered in the Telescope content management system prior to version 0.9.3. This vulnerability specifically targets the markdown processing functionality within the application, creating a pathway for malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability is particularly concerning because it affects authenticated users, meaning that attackers must first obtain valid credentials to exploit the flaw, but once inside the system, they can leverage this weakness to compromise other users. The vulnerability stems from insufficient input sanitization and validation within the markdown rendering engine, which fails to properly escape or filter user-supplied content before displaying it to other users. This allows attackers to craft malicious markdown content that, when rendered, executes unintended code in the browsers of other users who view the affected content. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic example of how user input processing can lead to severe security implications. From an operational perspective, this vulnerability enables attackers to perform various malicious activities including session hijacking, data theft, and redirection to malicious websites, potentially leading to complete compromise of user accounts and the broader application environment. The impact extends beyond simple script execution as it can facilitate more sophisticated attacks such as credential harvesting, privilege escalation, or even the deployment of malware through browser-based attack vectors. The vulnerability also maps to several ATT&CK techniques including T1566 for initial access through malicious content and T1059 for command and control through script execution. The security implications are particularly severe in environments where Telescope is used for collaborative content creation or community forums, as the attack surface expands significantly when multiple users interact with potentially malicious content. Organizations using affected versions of Telescope face substantial risk of unauthorized access and data compromise, especially when the system handles sensitive information or user-generated content that could be exploited for broader network infiltration. The remediation process requires immediate patching to version 0.9.3 or later, which includes proper input validation and sanitization mechanisms to prevent the injection of malicious content. Additionally, organizations should implement comprehensive content filtering, regular security audits, and user education regarding the dangers of clicking on untrusted links or content within collaborative environments. The vulnerability highlights the critical importance of proper input validation and the principle of least privilege in web application security, emphasizing that even authenticated users should be subject to strict content validation to prevent privilege escalation attacks. Security teams should also consider implementing web application firewalls and monitoring for suspicious content patterns to detect potential exploitation attempts. The incident underscores the necessity of maintaining up-to-date software versions and the importance of thorough security testing, particularly for applications that process user-generated content and rely on markdown or similar markup languages for content formatting and display.