CVE-2025-36116
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIBM Db2 Mirror for i 7.4, 7.5, and 7.6 GUI is affected by cross-site WebSocket hijacking vulnerability. By sending a specially crafted request, an unauthenticated malicious actor could exploit this vulnerability to sniff an existing WebSocket connection to then remotely perform operations that the user is not allowed to perform.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceIBM Db2 Mirror for i versions 7.4, 7.5, and 7.6 contain a cross-site WebSocket hijacking (CSWSH) vulnerability in the GUI component. An unauthenticated attacker can send a specially crafted request to hijack an existing user's WebSocket connection, allowing them to sniff the connection and execute operations that the legitimate user is authorized to perform.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 7.4= 7.5= 7.6CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm IBM Db2 Mirror for i installation and versionUse IBM i commands to display installed software (such as WRKPRD or DSPSFWRSC) and locate IBM Db2 Mirror for i in the product list. Note the installed version number.Affected if The installed version matches 7.4, 7.5, or 7.6 exactly.
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Determine if the GUI component is enabledCheck the IBM i HTTP server configuration and web administration settings to see if the Db2 Mirror GUI interface is configured and running. Look for web-based administration endpoints.Affected if The GUI web interface is accessible and operational.
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Identify exposed WebSocket endpointsReview the HTTP server configuration for WebSocket upgrade paths (ws:// or wss://) associated with the Db2 Mirror GUI. Use network inspection or server logs to enumerate active WebSocket connections.Affected if WebSocket endpoints for the GUI are exposed and accepting connections.
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Check for origin validation on WebSocket handshakeExamine the HTTP server or application configuration files that handle WebSocket upgrade requests. Look for origin header validation settings during the connection handshake.Affected if No origin validation is configured, or origin checking is disabled.
A user is affected if they have IBM Db2 Mirror for i version 7.4, 7.5, or 7.6 installed with the GUI component enabled and WebSocket connections exposed without proper origin validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement strict origin validation during the WebSocket handshake and enforce proper CSRF token validation for WebSocket connections to prevent unauthorized hijacking.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-36116 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-36116 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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