CVE-2025-25247: Apache Felix Webconsole XSS Vulnerability

CVE-2025-25247 Overview

CVE-2025-25247 is a Cross-Site Scripting (XSS) vulnerability affecting Apache Felix Webconsole, a widely-used web-based administration interface for OSGi frameworks. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into web pages viewed by other users.

This issue affects Apache Felix Webconsole 4.x up to 4.9.8 and 5.x up to 5.0.8. Users are strongly recommended to upgrade to version 4.9.10 or 5.0.10 or higher, which contains the security fix.

Critical Impact

Successful exploitation could allow attackers to execute arbitrary JavaScript in the context of authenticated administrator sessions, potentially leading to session hijacking, credential theft, or unauthorized administrative actions within OSGi-based applications.

Affected Products

• Apache Felix Webconsole 4.x versions up to and including 4.9.8
• Apache Felix Webconsole 5.x versions up to and including 5.0.8

Discovery Timeline

• 2025-02-10 - CVE-2025-25247 published to NVD
• 2025-07-14 - Last updated in NVD database

Technical Details for CVE-2025-25247

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The Apache Felix Webconsole fails to properly sanitize user-supplied input before rendering it within web pages, creating an injection point for malicious script content.

The vulnerability requires user interaction, as a victim must visit a crafted URL or page containing the malicious payload. Once triggered, the injected script executes within the security context of the authenticated user's browser session. This can enable attackers to steal session cookies, perform actions on behalf of the victim, or redirect users to malicious sites.

The impact extends beyond simple data exposure—since Felix Webconsole is an administrative interface for OSGi frameworks, successful exploitation could provide attackers with visibility into application configurations, bundle management, and system state information.

Root Cause

The root cause lies in insufficient input validation and output encoding within the Apache Felix Webconsole application. When user-controlled data is incorporated into HTML responses without proper sanitization or contextual encoding, it creates an opportunity for script injection. The vulnerability affects multiple version branches (4.x and 5.x), suggesting the flawed code pattern existed in shared components across major releases.

Attack Vector

The attack is network-based and requires user interaction. An attacker can craft a malicious URL containing JavaScript payloads that, when accessed by an authenticated administrator, executes in the context of their browser session. The cross-site scripting attack could be delivered through phishing emails, malicious links on forums, or by injecting content into pages that reference the vulnerable Webconsole endpoints.

Since the vulnerability changes the scope (affecting the user's browser rather than just the server), the impact extends to confidentiality and integrity of the user's session and any data accessible through the Webconsole interface.

Detection Methods for CVE-2025-25247

Indicators of Compromise

• Unusual JavaScript execution patterns in Apache Felix Webconsole access logs
• HTTP requests containing encoded script tags or JavaScript event handlers in URL parameters
• Unexpected session activity or administrative actions following user visits to external links
• Browser-based alerts or redirections when accessing Webconsole pages

Detection Strategies

• Monitor web application logs for requests containing common XSS payloads such as <script>, javascript:, onerror=, or encoded variants
• Implement Content Security Policy (CSP) headers and monitor for violations that may indicate injection attempts
• Deploy web application firewalls (WAF) with XSS detection rules targeting the Felix Webconsole endpoints
• Review authentication logs for session anomalies following suspicious Webconsole access patterns

Monitoring Recommendations

• Enable detailed access logging for all Felix Webconsole endpoints
• Configure alerting for HTTP requests with abnormal query string lengths or special character concentrations
• Monitor for CSP violation reports which may indicate attempted script injection
• Track session token usage patterns to detect potential session hijacking post-exploitation

How to Mitigate CVE-2025-25247

Immediate Actions Required

• Upgrade Apache Felix Webconsole to version 4.9.10 or 5.0.10 or higher immediately
• Review access logs for any indicators of prior exploitation attempts
• Restrict network access to the Felix Webconsole to trusted administrative networks only
• Implement Content Security Policy headers to mitigate script injection impact

Patch Information

Apache has released patched versions that address this vulnerability. Users running affected versions should upgrade to:

• Version 4.9.10 or higher for the 4.x branch
• Version 5.0.10 or higher for the 5.x branch

For detailed information about the security fix, refer to the Apache Security Mailing List Thread. Additional technical discussion is available on the Openwall OSS-Security Discussion.

Workarounds

• Restrict access to the Felix Webconsole to trusted internal networks using firewall rules or network segmentation
• Implement a reverse proxy with XSS filtering capabilities in front of the Webconsole
• Enable HTTP-only and Secure flags on session cookies to limit the impact of potential session theft
• Consider temporarily disabling the Webconsole if it is not critical to operations until patching can be completed

# Example: Restrict Felix Webconsole access via iptables
# Allow only trusted admin network (192.168.10.0/24) to access Webconsole port
iptables -A INPUT -p tcp --dport 8080 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP