CVE-2025-23908 in Pastebin Plugin
Summary
by MITRE • 01/16/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Rami Yushuvaev Pastebin allows Stored XSS.This issue affects Pastebin: from n/a through 1.5.
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Analysis
by VulDB Data Team • 02/10/2025
The vulnerability identified as CVE-2025-23908 represents a critical stored cross-site scripting flaw in the Pastebin application developed by Rami Yushuvaev. This weakness resides in the web page generation process where input validation and sanitization mechanisms fail to properly neutralize malicious user-supplied data before it is rendered in web pages. The vulnerability specifically impacts versions of Pastebin ranging from an unspecified initial version through version 1.5, indicating a broad affected scope that could potentially expose numerous installations to exploitation.
The technical root cause of this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation as a primary weakness leading to cross-site scripting attacks. When users submit content through the Pastebin interface, the application does not adequately sanitize or escape special characters that could be interpreted as HTML or JavaScript code by web browsers. This failure allows attackers to inject malicious scripts that persist in the application's database and execute whenever other users view the affected content, creating a stored XSS scenario that can compromise user sessions and steal sensitive information.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform a wide range of malicious activities including session hijacking, credential theft, and data exfiltration. Users who view compromised pastes could unknowingly have their browser sessions compromised, potentially allowing attackers to access their personal information, cookies, or other authenticated data. The stored nature of this vulnerability means that the malicious payload remains persistent within the application's database, making it particularly dangerous as it can affect multiple users over extended periods without requiring repeated exploitation attempts.
Mitigation strategies for CVE-2025-23908 should prioritize immediate implementation of proper input sanitization and output encoding mechanisms throughout the application's data handling pipeline. Organizations should implement comprehensive content security policies that prevent script execution in user-generated content, utilize proper HTML escaping for all dynamic content, and employ web application firewalls to detect and block malicious payloads. Additionally, the application should be updated to version 1.6 or later where this vulnerability has been resolved through proper input validation and sanitization measures. Security teams should also conduct regular penetration testing and code reviews to identify similar weaknesses in input processing, following ATT&CK framework techniques related to web application vulnerabilities and XSS exploitation methods to ensure comprehensive protection against this class of threat.