CVE-2025-49336 in BBS Plugin
Summary
by MITRE • 01/22/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in pondol Pondol BBS pondol-bbs allows Stored XSS.This issue affects Pondol BBS: from n/a through <= 1.1.8.4.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 01/22/2026
The CVE-2025-49336 vulnerability represents a critical cross-site scripting flaw in the pondol BBS software that enables stored XSS attacks. This vulnerability exists within the web page generation functionality of the pondol-bbs application, specifically in how user input is processed and rendered back to web pages. The issue allows attackers to inject malicious scripts that persist in the application's database and execute whenever other users view affected content, making it particularly dangerous for bulletin board systems where user-generated content is prevalent. The vulnerability affects all versions of pondol BBS up to and including version 1.1.8.4, indicating a long-standing flaw that has not been properly addressed in the software's input sanitization mechanisms.
The technical nature of this flaw stems from inadequate input validation and output encoding during the web page generation process. When users submit content through the BBS interface, the application fails to properly sanitize or escape special characters that could be interpreted as HTML or JavaScript code. This improper neutralization creates an environment where malicious scripts can be stored in the database and subsequently executed in the context of other users' browsers. The stored nature of this vulnerability means that the malicious payload remains persistent, executing every time affected pages are loaded, unlike reflected XSS attacks that require specific user interaction. This vulnerability directly maps to CWE-79, which specifically addresses cross-site scripting flaws where input data is not properly neutralized before being used in web page generation.
The operational impact of CVE-2025-49336 is severe for any organization relying on pondol BBS for communication or information sharing. Attackers can exploit this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious websites, or even escalate privileges within the application. The persistent nature of stored XSS means that the attack surface remains active until the vulnerability is patched, potentially allowing attackers to maintain access to compromised systems for extended periods. Organizations using this BBS software may face data breaches, unauthorized access to sensitive information, and potential compliance violations if user data is compromised. The vulnerability also poses risks to the application's integrity and user trust, as malicious actors can manipulate content displayed to other users. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1566.001 for initial access through malicious content and T1059.001 for command and control through script injection.
Mitigation strategies for CVE-2025-49336 should prioritize immediate patching of affected pondol BBS installations to version 1.1.8.5 or later, assuming such updates are available. Organizations should implement comprehensive input validation and output encoding mechanisms, ensuring all user-generated content is properly sanitized before storage and rendering. The implementation of Content Security Policy headers can provide additional protection against script execution, while regular security audits of input handling processes should be conducted. Organizations should also consider implementing web application firewalls to detect and block suspicious input patterns, and establish monitoring procedures to identify potential exploitation attempts. Given the nature of this vulnerability, administrators should review and reset user sessions, particularly for privileged accounts, following any suspected exploitation. The remediation process should include thorough testing of input sanitization mechanisms to ensure that all potential attack vectors are properly addressed.