CVE-2025-49336 is a stored Cross-site Scripting (XSS) vulnerability found in pondol Pondol BBS, a bulletin board system software, affecting versions up to and including 1.1.8.4. The vulnerability stems from improper neutralization of user-supplied input during web page generation, which allows malicious scripts to be stored on the server and executed in the browsers of other users viewing the affected content. This type of vulnerability can be exploited by an attacker with low privileges (PR:L) who can submit crafted input that requires user interaction (UI:R) to trigger the malicious payload. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), and a scope change (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality and integrity (C:L/I:L) but not availability (A:N). Although no known exploits are currently reported in the wild, the vulnerability poses a risk of session hijacking, credential theft, or unauthorized actions performed on behalf of users. Pondol BBS is used for online community discussions, so exploitation could lead to widespread impact on user trust and data privacy. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies.

For European organizations using Pondol BBS, this vulnerability could lead to unauthorized disclosure of sensitive information such as session tokens or personal data, compromising user confidentiality. Integrity could be impacted by attackers injecting malicious scripts that alter displayed content or perform unauthorized actions on behalf of users. Although availability is not directly affected, the reputational damage and potential regulatory consequences under GDPR for data breaches could be significant. Organizations relying on Pondol BBS for community engagement or internal communications may face increased risk of targeted attacks exploiting this vulnerability. The medium severity score reflects a moderate risk, but the scope change indicates that the impact could extend beyond the initial vulnerable component, potentially affecting multiple users or integrated systems.

1. Immediately review and restrict user input fields to disallow or sanitize HTML and script tags. 2. Implement robust output encoding/escaping on all user-generated content before rendering in web pages, using context-appropriate encoding (e.g., HTML entity encoding). 3. Apply Content Security Policy (CSP) headers to restrict execution of unauthorized scripts in browsers. 4. Limit user privileges to the minimum necessary, reducing the ability of attackers to submit malicious content. 5. Monitor and audit user-generated content for suspicious scripts or payloads. 6. Engage with the vendor or community to obtain patches or updates addressing this vulnerability as soon as they become available. 7. Educate users about the risks of interacting with untrusted content and encourage cautious behavior. 8. Consider deploying web application firewalls (WAFs) with rules targeting XSS payloads specific to Pondol BBS.