CVE-2025-55462: Eramba CORS Misconfiguration Vulnerability

CVE-2025-55462 Overview

A Cross-Origin Resource Sharing (CORS) misconfiguration vulnerability has been identified in Eramba Community and Enterprise Editions version 3.26.0. This security flaw allows an attacker-controlled Origin header to be reflected in the Access-Control-Allow-Origin response header along with Access-Control-Allow-Credentials: true. This dangerous combination permits malicious third-party websites to perform authenticated cross-origin requests against the Eramba API, targeting sensitive endpoints including /system-api/login and /system-api/user/me.

Critical Impact

This CORS misconfiguration enables full session hijack and data exfiltration without user interaction. Attackers can steal sensitive user session data including user ID, name, email, and access group information through malicious JavaScript on attacker-controlled domains.

Affected Products

• Eramba Community Edition v3.26.0
• Eramba Enterprise Edition v3.26.0
• Default installations (no custom configuration required for exploitation)

Discovery Timeline

• 2026-01-13 - CVE CVE-2025-55462 published to NVD
• 2026-01-13 - Last updated in NVD database

Technical Details for CVE-2025-55462

Vulnerability Analysis

The vulnerability stems from improper CORS policy implementation in Eramba's web application. When a malicious website sends a cross-origin request to the Eramba API with a crafted Origin header, the server improperly reflects this attacker-controlled value in the Access-Control-Allow-Origin response header. Combined with the Access-Control-Allow-Credentials: true directive, this configuration instructs browsers to include authentication cookies with cross-origin requests, effectively bypassing same-origin policy protections.

The response from sensitive API endpoints like /system-api/user/me contains valuable user session data including the user's ID, full name, email address, and access group memberships. Since the CORS policy allows any origin to make credentialed requests, an attacker's JavaScript code can read these responses directly, leading to information disclosure and session hijacking.

Testing indicates that Eramba versions 3.23.3 and earlier do not exhibit this vulnerability, suggesting the misconfiguration was introduced in a later release between 3.23.3 and 3.26.0.

Root Cause

The root cause is an overly permissive CORS configuration that reflects arbitrary Origin headers while simultaneously allowing credentialed requests. Secure CORS implementations should either use a strict whitelist of allowed origins or avoid reflecting arbitrary origins when credentials are enabled. The vulnerable configuration violates the principle of least privilege by trusting all origin domains equally.

Attack Vector

The attack requires a victim user to visit a malicious website while authenticated to the Eramba application. The attacker's website contains JavaScript that initiates cross-origin XMLHttpRequest or Fetch API calls to the Eramba API endpoints. Due to the CORS misconfiguration, the browser includes the victim's session cookies with these requests, and the responses containing sensitive data are accessible to the attacker's JavaScript code.

The attack sequence involves the malicious JavaScript making requests to endpoints such as /system-api/login and /system-api/user/me, receiving authenticated responses containing session tokens and user profile data. This information can be exfiltrated to attacker-controlled servers, enabling account takeover and unauthorized access to the victim's Eramba instance.

Detection Methods for CVE-2025-55462

Indicators of Compromise

• Unusual cross-origin requests to Eramba API endpoints from unfamiliar domains
• Multiple API requests to /system-api/login or /system-api/user/me originating from different external referrers
• Web server logs showing requests with suspicious Origin headers that differ from legitimate application domains
• Evidence of session data being accessed from IP addresses or user agents inconsistent with normal user activity

Detection Strategies

• Monitor web server access logs for API requests containing untrusted or unknown Origin headers
• Implement Content Security Policy (CSP) reporting to detect when the application is being embedded or accessed from unauthorized domains
• Review authentication logs for anomalous session usage patterns that may indicate stolen credentials
• Deploy web application firewall (WAF) rules to flag requests with suspicious cross-origin characteristics

Monitoring Recommendations

• Enable detailed logging of all requests to sensitive API endpoints including /system-api/login and /system-api/user/me
• Configure alerting on CORS-related response headers being sent to unusual origin domains
• Monitor for bulk data exfiltration patterns from user profile endpoints
• Track session token usage across different IP addresses and geographic locations

How to Mitigate CVE-2025-55462

Immediate Actions Required

• Upgrade Eramba to version 3.28.0 or later which addresses this vulnerability
• Implement a strict whitelist of allowed origins in the CORS configuration
• Force re-authentication for all active user sessions after applying the patch
• Review access logs for evidence of prior exploitation

Patch Information

Eramba has released version 3.28.0 which addresses this CORS misconfiguration vulnerability. Organizations should upgrade to this version or later to remediate the security issue. Detailed release information is available in the Eramba Release Discussion 3.28.0.

Workarounds

• Deploy a reverse proxy or web application firewall (WAF) in front of Eramba to enforce strict CORS policies by stripping or validating Origin headers
• Restrict network access to the Eramba instance using firewall rules to limit exposure to trusted networks only
• Implement additional authentication factors to reduce the impact of potential session hijacking
• Consider placing the Eramba application behind a VPN to limit attack surface from external malicious websites