CVE-2026-31906: Apache OFBiz XSS Vulnerability

CVE-2026-31906 Overview

CVE-2026-31906 is a Cross-Site Scripting (XSS) vulnerability in Apache OFBiz, an open-source enterprise resource planning (ERP) system. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers can inject malicious script content that executes in the browser of an authenticated user who interacts with a crafted link or request. The issue affects all Apache OFBiz versions prior to 24.09.06. The Apache Software Foundation has released version 24.09.06 to address the vulnerability.

Critical Impact

Successful exploitation allows attackers to execute arbitrary scripts in victim browsers, leading to session compromise, credential theft, and unauthorized actions within the OFBiz application.

Affected Products

• Apache OFBiz versions prior to 24.09.06
• Deployments exposing OFBiz web interfaces to untrusted users
• ERP environments running unpatched Apache OFBiz instances

Discovery Timeline

• 2026-05-19 - CVE-2026-31906 published to NVD
• 2026-05-19 - Last updated in NVD database

Technical Details for CVE-2026-31906

Vulnerability Analysis

The vulnerability resides in Apache OFBiz web page generation logic where user-controlled input is reflected into HTML responses without sufficient encoding or sanitization. An attacker crafts a URL or form parameter containing JavaScript payloads. When a victim loads the resulting page, the browser executes the injected script in the context of the OFBiz application origin.

The scope change in the CVSS vector indicates that the injected script affects resources beyond the vulnerable component, such as other authenticated sessions or browser-stored data. User interaction is required, typically through a phishing link or a malicious site that triggers a request to the vulnerable endpoint.

The EPSS score reports a probability of 0.169% with a percentile of 37.58, indicating low observed exploitation activity at publication. No public proof-of-concept exploit is currently available.

Root Cause

The root cause is missing output encoding when reflecting input parameters into HTML, JavaScript, or attribute contexts within OFBiz screens. The application returns user-controlled values without applying context-appropriate escaping, allowing browser parsers to interpret attacker-supplied data as executable script.

Attack Vector

The attack vector is network-based and requires victim interaction. An attacker delivers a crafted link via email, chat, or a malicious web page. When an authenticated OFBiz user clicks the link, the payload executes in their session. Consult the Apache Mailing List Thread and the Openwall OSS-Security Update for advisory details.

Detection Methods for CVE-2026-31906

Indicators of Compromise

• Web server access logs showing OFBiz request parameters containing <script>, javascript:, onerror=, or onload= patterns
• Outbound browser requests from internal users to unfamiliar domains following OFBiz session activity
• Unexpected administrative actions performed by authenticated OFBiz accounts

Detection Strategies

• Inspect HTTP request logs for reflected XSS payloads targeting OFBiz endpoints and screen parameters
• Deploy a Web Application Firewall (WAF) ruleset that flags XSS signatures against OFBiz URL paths
• Correlate Content Security Policy (CSP) violation reports with OFBiz user sessions to surface injection attempts

Monitoring Recommendations

• Forward OFBiz application and reverse proxy logs to a centralized SIEM for query and alerting
• Alert on anomalous parameter lengths or encoded payloads on OFBiz request paths
• Monitor authenticated user sessions for atypical action sequences indicative of script-driven activity

How to Mitigate CVE-2026-31906

Immediate Actions Required

• Upgrade Apache OFBiz to version 24.09.06 or later across all environments
• Restrict network exposure of OFBiz administrative interfaces to trusted networks or VPN access
• Invalidate active OFBiz user sessions after applying the patch to terminate any compromised tokens

Patch Information

The Apache Software Foundation has released Apache OFBiz 24.09.06, which remediates CVE-2026-31906. Administrators should upgrade following the upgrade guidance in the Apache Mailing List Thread announcement.

Workarounds

• Deploy a WAF policy blocking script tags and event-handler attributes in OFBiz query strings and form data
• Enforce a strict Content Security Policy (CSP) header on OFBiz responses to limit inline script execution
• Require multi-factor authentication for OFBiz accounts to reduce the impact of stolen session tokens

# Example CSP header to limit inline script execution on OFBiz responses
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'