CVE-2025-27895: IBM DB2 Recovery Expert XSS Vulnerability

CVE-2025-27895 is a cross-site scripting vulnerability in IBM DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2 that allows unauthenticated attackers to inject malicious JavaScript code into the Web UI. This article covers technical details, affected versions, potential impact on credential security, and recommended mitigation strategies.

CVE-2025-27895 Overview

CVE-2025-27895 is a cross-site scripting (XSS) vulnerability in IBM DB2 Recovery Expert for Linux, UNIX and Windows version 5.5 IF 2. An unauthenticated attacker can embed arbitrary JavaScript code in the Web UI, altering intended functionality and potentially exposing user credentials within a trusted session. The flaw is tracked under CWE-79: Improper Neutralization of Input During Web Page Generation. IBM published a security advisory documenting the issue and remediation guidance.

Critical Impact
Unauthenticated attackers can inject JavaScript into the Web UI, potentially leading to credential disclosure within authenticated sessions.

Affected Products

IBM DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2
Web UI component of the recovery management console
Deployments exposing the management interface to untrusted networks

Discovery Timeline

2026-10-12 - CVE-2025-27895 published to the National Vulnerability Database
2026-10-13 - Last updated in NVD database

Technical Details for CVE-2025-27895

Vulnerability Analysis

The vulnerability resides in the Web UI of IBM DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2. User-supplied input reaches the rendered HTML output without proper neutralization. An attacker can craft a request or link that embeds arbitrary JavaScript into the page context.

Because exploitation requires user interaction, successful attacks typically involve delivering a crafted URL to an authenticated administrator or operator. When the victim visits the link, the injected script executes under the origin of the Recovery Expert Web UI. The attack scope is changed, meaning the injected code can affect resources beyond the vulnerable component's security authority.

The injected JavaScript can read session tokens, manipulate the DOM to present phishing content, or issue authenticated requests on behalf of the victim. Credential disclosure is the primary documented consequence.

Root Cause

The root cause is improper neutralization of input during Web UI page generation [CWE-79]. The application fails to encode or sanitize untrusted data before rendering it in HTML contexts, allowing attacker-controlled strings to be interpreted as script.

Attack Vector

The attack is delivered over the network and requires no privileges. An attacker crafts a malicious URL or request targeting the vulnerable Web UI endpoint and tricks a legitimate user into interacting with it. Once the payload renders, the browser executes attacker JavaScript within the trusted session, enabling theft of credentials or session identifiers. No code example is published for this issue; refer to the IBM Security Advisory for additional technical context.

Detection Methods for CVE-2025-27895

Indicators of Compromise

Web server access logs containing URL parameters with <script>, javascript:, or encoded script payloads targeting Recovery Expert endpoints.
Outbound HTTP requests from administrator browsers to unknown domains immediately after accessing the Recovery Expert Web UI.
Unexpected session reuse or logins from new geolocations following administrator interaction with crafted links.

Detection Strategies

Deploy a web application firewall (WAF) with reflected XSS signatures tuned to the Recovery Expert Web UI request paths.
Enable HTTP request logging and inspect query strings and POST bodies for script-like payloads and HTML control characters.
Correlate browser telemetry with administrator sessions to identify execution of unapproved inline scripts on the management console.

Monitoring Recommendations

Monitor Recovery Expert Web UI endpoints for anomalous parameters, encoded payloads, and repeated requests from the same source.
Alert on authenticated administrator sessions that generate requests inconsistent with normal console workflows.
Review Content Security Policy (CSP) violation reports if CSP headers are configured on the management interface.

How to Mitigate CVE-2025-27895

Immediate Actions Required

Apply the fix referenced in the IBM Security Advisory for IBM DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2.
Restrict Web UI access to trusted management networks and require VPN or jump-host access for administrators.
Instruct administrators to avoid clicking untrusted links while authenticated to the Recovery Expert console.

Patch Information

IBM has published remediation guidance in its security advisory. Review the IBM Security Advisory and apply the vendor-supplied fix or interim fix pack appropriate to your deployment. Validate the patched build in a staging environment before promoting to production.

Workarounds

Place the Recovery Expert Web UI behind a reverse proxy that enforces strict input filtering and a Content Security Policy that disallows inline scripts.
Terminate administrator sessions with short idle timeouts to reduce the window for session theft.
Use dedicated administrative browsers or isolated workstations that do not browse general internet content during Recovery Expert sessions.

bash

# Example reverse proxy header hardening for the management interface
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header Referrer-Policy "no-referrer" always;