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Db2 Recovery Expert EUVDEUVD-2025-211062

| CVE-2025-27902 MEDIUM
Use of Web Link to Untrusted Target with window.opener Access (CWE-1022)
2026-10-12 ibm GHSA-53cf-cjq2-f8cj
6.1
CVSS 3.1 · Vendor: ibm
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Craft malicious link with untrusted reference
  2. Exploit
    Deliver link to victim via phishing
  3. Execution
    Victim clicks and browser follows redirect
  4. Impact
    Expose sensitive info or perform unauthorized browser action

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V3 - Web Frontend Security Window.opener access prevention
Exploitation Conditions

Exploitation requires the victim to actively click an attacker-crafted link that resolves through the application's untrusted external web reference (UI:R) - it cannot be triggered server-side or automatically. No authentication is needed by the attacker to craft the link (PR:N), but the limiting factor is social engineering: the attacker must induce a legitimate user of the Db2 Recovery Expert 5.5 IF 2 web interface to follow the malicious redirect. Impact is confined to the victim's browser context (sensitive information exposure or unauthorized browser-side actions), not the server host.

Impact

This is a moderate-severity open redirect / untrusted link vulnerability (CWE-1022) in IBM Db2 Recovery Expert for LUW 5.5 IF 2, scored CVSS 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). The CVSS vector shows network attack vector, low complexity, and no privileges required (PR:N, unauthenticated), but it mandates user interaction (UI:R) - the victim must click a crafted link - and only low confidentiality and integrity impact with no availability impact, which is consistent with a client-side redirect/phishing-assist bug rather than server compromise. No EPSS score, CISA KEV listing, or public POC was provided in the input, so there is no evidence of active exploitation or widespread automated attack; absence of these signals plus the UI:R requirement strongly suggests this is a low real-world-priority issue despite the 'network/unauthenticated' framing. The scope change (S:C) reflects that the impact lands in the victim's browser/another security context rather than the vulnerable component itself. Overall: a genuine but low-urgency issue - patch in normal cycles, not an emergency.

Exploit ScenarioDerived

An attacker crafts a malicious URL leveraging the application's untrusted web link and sends it to a victim via phishing email or chat. When the victim clicks and their browser follows the untrusted reference, the attacker can redirect them to an attacker-controlled site to harvest credentials or trigger unauthorized actions in the victim's browser session. No public exploit code was identified at time of analysis; success depends entirely on the victim clicking the crafted link.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 12, 2026

Untrusted external web-link handling in IBM Db2 Recovery Expert for Linux, UNIX and Windows 5.5 Interim Fix 2 allows a remote, unauthenticated attacker to craft a link that can expose sensitive information or trigger unauthorized actions inside a victim's browser (CWE-1022). The flaw cannot be triggered server-side or automatically: it requires the victim to click an attacker-supplied link that resolves through the application's untrusted external reference, so the practical barrier is social engineering rather than authentication (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, score 6.1). Impact is confined to the victim's browser context rather than the Db2 Recovery Expert host, and no public exploit code or confirmed active exploitation (CISA KEV) was identified at time of analysis.

RemediationAI

Apply the vendor fix for IBM Db2 Recovery Expert for Linux, UNIX and Windows 5.5: patch status is 'Patch available per vendor advisory' via https://www.ibm.com/support/pages/node/7290893, which should be consulted for the exact 5.5 interim fix or fix-pack level to install - no specific fix version is enumerated in the available data, so do not assume a version number without checking that page. Because exploitation is entirely UI-driven (UI:R) and depends on a user clicking a malicious link that resolves through the untrusted external reference, compensating controls can meaningfully reduce exposure while patching is scheduled: restrict network access to the Db2 Recovery Expert web console to trusted administrative subnets or VPN and require administrators to use a dedicated, low-privilege browser profile for it, accepting the operational friction of a separate session; block outbound browsing from administrative workstations and servers hosting the console so external redirect targets cannot be reached - at the trade-off of also blocking legitimate external documentation links; and instruct console users not to follow externally sourced links (email, chat, tickets) while an authenticated Db2 Recovery Expert session is open, since that is the delivery vector. Do not rely on these workarounds as a substitute for the vendor patch, and note that browser-level protections against opener abuse are inconsistent across versions and cannot be assumed. No public exploit code or confirmed active exploitation was identified at time of analysis, so prioritization should follow normal moderate-severity patching cadence for internet- or broadly reachable administrative consoles.

Affected VersionsENISA

DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2

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Technical ContextAI · show details

The root cause class is CWE-1022, Use of Web Link to Untrusted Target with window.opener Access. In practice this means the Db2 Recovery Expert 5.5 IF 2 web interface renders or follows a hyperlink to an external site without appropriately constraining the trust relationship between the two pages - for example a target="_blank" style link that leaves window.opener accessible, allowing the untrusted destination page to navigate or manipulate the originating Db2 Recovery Expert browser window (often called reverse tabnabbing), or an externally-referenced link whose destination is not validated. Because the affected page runs in the victim's browser within the context of the administrative console, an attacker who controls or redirects the external target can attempt to read exposed information or push the victim's browser into unauthorized actions. The CVSS vector reflects this scope change: S:C indicates impact crosses a trust boundary into the browser, while C:L and I:L capture limited confidentiality and integrity impact and A:N confirms no availability impact. The CPE cpe:2.3:a:ibm:db2_recovery_expert_for_linux,_unix_and_windows:*:*:*:*:*:*:*:* uses a wildcard version, so the exact affected build range is defined only by IBM's advisory rather than by the CPE. This is a client-side, UI-dependent weakness - it is not a SQL injection, memory-corruption, or server-side remote code execution flaw in the Db2 Recovery Expert service itself.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (ibm) PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
vuln.today AI 6.1 MEDIUM

Open redirect reachable over the network without privileges (PR:N) but requiring the victim to click (UI:R); impact crosses into the browser context (S:C) with limited C/I and no availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionCVE.org

IBM DB2 Recovery Expert for Linux, UNIX and Windows 5.5 IF 2 uses a web link with untrusted references to an external site. A remote attacker could exploit this vulnerability to expose sensitive information or perform unauthorized actions on the victims’ web browser

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Prevalence
Low
niche IBM database-recovery admin tool, specialist DBA footprint
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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