CVE-2025-48236 in bunny.net Plugin
Summary
by MITRE • 05/19/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bunny.net bunny.net allows Stored XSS. This issue affects bunny.net: from n/a through 2.3.0.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 05/19/2025
The vulnerability identified as CVE-2025-48236 represents a critical cross-site scripting flaw within the bunny.net web application framework that enables stored XSS attacks. This weakness manifests in the improper neutralization of input data during web page generation processes, creating persistent security risks for users interacting with affected systems. The vulnerability specifically impacts versions of bunny.net ranging from an unspecified starting point through version 2.3.0, indicating a broad affected scope that likely encompasses multiple releases and deployment configurations.
The technical implementation of this XSS vulnerability occurs when user-supplied input data is not adequately sanitized or escaped before being rendered in web page content. This failure allows malicious actors to inject malicious scripts that persist in the application's database or storage mechanisms, making the vulnerability classified as stored XSS rather than reflected or DOM-based variants. The flaw directly violates security principles governing input validation and output encoding, creating opportunities for attackers to execute malicious code within the context of victim sessions. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting issues in web applications.
The operational impact of CVE-2025-48236 extends beyond simple data theft or session hijacking, as stored XSS attacks can enable comprehensive compromise of user accounts and sensitive data. Attackers can leverage this vulnerability to execute persistent malicious scripts that manipulate web page content, steal authentication tokens, redirect users to malicious sites, or perform actions on behalf of authenticated users. The persistent nature of stored XSS means that once exploited, the malicious code continues to execute whenever affected pages are loaded, potentially affecting numerous users over extended periods. This vulnerability directly maps to ATT&CK technique T1531 which focuses on manipulation of web applications and T1203 which covers exploitation of web application vulnerabilities.
Organizations utilizing bunny.net versions within the affected range face significant security implications from this vulnerability, as it provides attackers with a persistent foothold within their web applications. The risk assessment should consider potential data breaches, credential theft, and service disruption that could result from successful exploitation. Mitigation strategies should prioritize immediate deployment of patches or updates to versions beyond 2.3.0, implementation of robust input validation controls, and comprehensive output encoding measures. Additionally, organizations should conduct thorough security assessments of their web applications to identify potential similar vulnerabilities and establish monitoring procedures to detect unauthorized script injections. The remediation approach must align with industry best practices for XSS prevention including proper HTML escaping, Content Security Policy implementation, and regular security testing of web applications to prevent future occurrences of similar vulnerabilities.