CVE-2026-17047: IBM Db2 Mirror Information Disclosure Flaw

CVE-2026-17047 Overview

CVE-2026-17047 affects IBM Db2 Mirror for i versions 7.4, 7.5, and 7.6. The vulnerability stems from improper request validation, which a remote attacker can exploit to obtain sensitive information. The weakness is classified as Cross-Site Request Forgery [CWE-352]. Exploitation requires user interaction, such as convincing an authenticated user to visit a crafted page or click a malicious link. Successful attacks can expose sensitive data and modify limited application state within the victim's session.

Critical Impact
A remote attacker can trigger unauthorized requests from an authenticated user's browser, leading to disclosure of sensitive information and integrity impact within IBM Db2 Mirror for i.

Affected Products

IBM Db2 Mirror for i 7.4
IBM Db2 Mirror for i 7.5
IBM Db2 Mirror for i 7.6

Discovery Timeline

2026-09-14 - CVE-2026-17047 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-17047

Vulnerability Analysis

CVE-2026-17047 is a Cross-Site Request Forgery (CSRF) issue in IBM Db2 Mirror for i. The product fails to properly validate the origin or authenticity of incoming requests. An attacker who lures an authenticated administrator or user to a malicious page can cause the victim's browser to issue unintended requests to the Db2 Mirror for i management interface. Because the browser attaches the user's active session context, the application processes these requests as if the user initiated them. The attack can result in disclosure of sensitive data and limited modification of application state, though availability is not affected.

Root Cause

The root cause is missing or insufficient request validation, specifically the absence of enforceable anti-CSRF controls such as synchronizer tokens, SameSite cookie attributes, or origin and referer verification. Without these protections, the application cannot distinguish between requests initiated by the legitimate user interface and requests forged by an attacker-controlled site. This class of weakness is tracked under CWE-352: Cross-Site Request Forgery.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker crafts a web page, email, or script that issues requests to the Db2 Mirror for i interface. When an authenticated user loads the attacker-controlled content, the browser submits the forged requests using the user's session cookies. No prior privileges on the target application are required by the attacker, but the victim must hold an active session with the vulnerable product. Refer to the IBM Support Page for vendor-specific technical detail.

Detection Methods for CVE-2026-17047

Indicators of Compromise

Unexpected state-changing requests in Db2 Mirror for i application logs that originate from external referer headers or lack a valid CSRF token.
Session activity from authenticated users at unusual times or from unexpected geolocations tied to browser-driven requests.
HTTP requests to Db2 Mirror for i endpoints with Origin or Referer headers pointing to untrusted domains.

Detection Strategies

Inspect web server and reverse proxy access logs for requests to sensitive Db2 Mirror for i endpoints with missing or mismatched Referer and Origin headers.
Correlate authentication events with subsequent administrative actions to identify sequences consistent with drive-by request forgery.
Deploy web application firewall (WAF) rules that flag cross-origin POST requests to management URLs.

Monitoring Recommendations

Enable verbose auditing on IBM Db2 Mirror for i administrative interfaces and forward logs to a centralized SIEM.
Monitor egress traffic from administrator workstations for connections to suspicious domains that could host CSRF payloads.
Alert on any configuration or data-export action performed within a short window after a user visits an external URL.

How to Mitigate CVE-2026-17047

Immediate Actions Required

Apply the fixes referenced in the IBM Support advisory for Db2 Mirror for i 7.4, 7.5, and 7.6.
Restrict network access to Db2 Mirror for i management interfaces to trusted administrative subnets.
Require administrators to use dedicated browsers or privileged access workstations when managing Db2 Mirror for i.

Patch Information

IBM has published remediation guidance on the vendor advisory. Administrators should review the IBM Support Page for the specific PTF or fix pack applicable to their installed version of Db2 Mirror for i 7.4, 7.5, or 7.6, and apply it during the next maintenance window.

Workarounds

Terminate Db2 Mirror for i administrative sessions immediately after use to reduce the window in which a CSRF request can succeed.
Enforce SameSite=Strict cookie policies at the reverse proxy layer where feasible to limit cross-site request submission.
Block access to the management interface from general-purpose user networks using firewall or network segmentation controls.

bash

# Example: restrict access to Db2 Mirror for i admin interface using iptables
iptables -A INPUT -p tcp --dport 2006 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 2006 -j DROP