CVE-2025-40652 Overview
CVE-2025-40652 is a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in the CoverManager booking software. Attackers can inject malicious scripts into the application that are permanently stored on the server. These scripts execute in the browser of any user who visits the affected page, without requiring further interaction beyond page navigation. Successful exploitation can allow attackers to steal session cookies, harvest login credentials, and perform actions on behalf of authenticated users. The vulnerability is exploitable over the network without authentication and requires only limited user interaction such as viewing the affected page.
Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, enabling session theft, credential harvesting, and impersonation of authenticated CoverManager users.
Affected Products
- CoverManager booking software
Discovery Timeline
- 2025-05-26 - CVE-2025-40652 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-40652
Vulnerability Analysis
The vulnerability is a stored XSS flaw classified under [CWE-79], Improper Neutralization of Input During Web Page Generation. User-supplied input is accepted by the CoverManager application and persisted server-side without adequate output encoding or input sanitization. When other users retrieve pages containing the stored payload, the injected script executes in the security context of the CoverManager origin. This grants the attacker access to the Document Object Model (DOM), cookies not marked HttpOnly, and any client-side state accessible to the victim.
Root Cause
The application fails to neutralize HTML and JavaScript metacharacters in stored user input. Data written into persistent storage is rendered back into HTML responses without contextual escaping. This lets attacker-controlled <script> tags, event handlers, or JavaScript URIs execute when the affected page is loaded by any subsequent visitor.
Attack Vector
An unauthenticated remote attacker submits a payload containing JavaScript into an input field that is later rendered to other users. The payload is stored on the server. Each time a user loads the affected page, the malicious script executes automatically. Impact scenarios include session cookie theft, phishing overlays that capture credentials, forced actions using the victim's session, and redirection to attacker-controlled infrastructure. See the INCIBE Security Notice for advisory details.
Detection Methods for CVE-2025-40652
Indicators of Compromise
- Unexpected <script>, <img onerror=...>, or javascript: strings stored in CoverManager database fields such as booking notes, customer names, or comments.
- Outbound browser requests from user sessions to unknown domains shortly after loading CoverManager pages.
- Anomalous session activity such as account actions performed from unfamiliar IP addresses or user agents.
Detection Strategies
- Review web application logs for HTTP requests containing encoded or literal script tags, event handler attributes, or common XSS payload markers.
- Query stored records in the CoverManager backend for HTML control characters and JavaScript keywords in fields that should contain plain text.
- Deploy a Web Application Firewall (WAF) rule set to flag reflected and stored XSS payloads targeting CoverManager endpoints.
Monitoring Recommendations
- Monitor Content Security Policy (CSP) violation reports for blocked inline script executions on CoverManager pages.
- Alert on outbound requests from user browsers to non-approved domains during CoverManager sessions.
- Track authentication anomalies including concurrent logins, new device fingerprints, and unexpected account modifications.
How to Mitigate CVE-2025-40652
Immediate Actions Required
- Contact CoverManager to confirm patch availability and apply vendor-supplied fixes as soon as they are released.
- Audit all stored user-generated content for existing XSS payloads and sanitize or remove malicious entries.
- Invalidate active sessions and require credential rotation for users who may have visited compromised pages.
Patch Information
No public patch reference is available in the NVD entry. Refer to the INCIBE Security Notice and contact CoverManager directly for remediation guidance and fixed versions.
Workarounds
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
- Mark session cookies with HttpOnly, Secure, and SameSite=Strict attributes to limit theft via JavaScript.
- Deploy WAF signatures that block common XSS payload patterns targeting CoverManager input fields.
- Restrict administrative CoverManager access to trusted networks and require multi-factor authentication for staff accounts.
# Example Content Security Policy header to mitigate stored XSS
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'
# Example cookie hardening
Set-Cookie: session=<value>; HttpOnly; Secure; SameSite=Strict
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
