CVE-2026-42538
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 · uneditedIRIS is a web collaborative platform that helps incident responders share technical details during investigations. Versions prior to 2.4.28 do not properly validate uploaded files. The application can therefore be misused to host phishing pages, amongst other things. This also creates another instance of a Cross-Site Scripting (XSS) vulnerability. Version 2.4.28 contains a patch.
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 confidenceIRIS versions before 2.4.28 lack proper validation of uploaded files, allowing attackers to upload malicious content including phishing pages. This improper file validation creates a stored Cross-Site Scripting (XSS) vulnerability where malicious files can be hosted on the platform.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
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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Identify IRIS installation and versionLocate the IRIS application installation directory and check for a version file, manifest, or configuration that displays the installed version number. Common locations include a VERSION file, package.json, or the main application binary with a version flag.Affected if The installed version is lower than 2.4.28 (e.g., 2.4.27, 2.4.0, 1.x.x)
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Verify file upload functionality is enabledAccess the IRIS web interface or API documentation and locate any file upload endpoints or features. Check if the upload functionality is accessible to regular users or unauthenticated attackers.Affected if File upload endpoints are accessible and not restricted to admin-only roles
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Inspect file type validation configurationReview the file upload handler configuration or code to determine what validation is performed on uploaded files. Look for checks on file extensions, Content-Type headers, or file content/magic bytes.Affected if Only extension-based validation exists without magic byte or Content-Type verification; or no validation is configured
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Test upload capability with a benign fileUse a test account to attempt uploading a file through the IRIS upload feature. Confirm the file is stored and accessible via a direct URL.Affected if Files can be uploaded and are served from a predictable URL path, enabling phishing content hosting
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Check for XSS payload storageUpload a test file containing an XSS payload (e.g., a file with HTML/Script content or a filename with script tags) and then access the file to see if the payload executes.Affected if Uploaded files with malicious content are served without sanitization and XSS triggers in the browser
You are affected if IRIS version is below 2.4.28 AND the file upload feature is accessible and lacks proper validation on file content.
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.
dbcve · scopedUpgrade to IRIS version 2.4.28 which contains the patch, or implement proper file type validation and content sanitization for all uploaded files.
2.4.28
- 1. Identify the current installed version of IRIS in your environment
- 2. If the current version is earlier than 2.4.28, plan an upgrade to version 2.4.28 or later
- 3. Before upgrading, backup the IRIS application and database
- 4. Upgrade IRIS to version 2.4.28 following the official upgrade documentation
- 5. After upgrade, verify that file upload functionality properly validates file types and content
- 6. Confirm the unrestricted file upload vulnerability is resolved by testing file upload with potentially malicious file types
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42538 — 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-2026-42538 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data