CVE-2026-50758
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 · uneditedCross Site Scripting vulnerability in DayuanJiang next-ai-draw-io 0.4.13 allows a remote attacker to execute arbitrary code via the mcp parameter
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 · moderate confidenceCross-Site Scripting (XSS) vulnerability in next-ai-draw-io version 0.4.13 allows remote attackers to inject arbitrary JavaScript code through the mcp parameter. The injected payload executes in victims' browsers, potentially stealing session cookies or performing actions on behalf of authenticated users.
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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 installed version of next-ai-draw-ioCheck the package.json file, npm list output, or application banner for the exact version number of next-ai-draw-ioAffected if Version is 0.4.13 exactly, or falls within any version range containing 0.4.13 if additional ranges are disclosed
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Locate the mcp parameter handlerSearch application source code for endpoint handlers that process the 'mcp' query parameter or POST body fieldAffected if Code contains a route handling the mcp parameter without visible sanitization
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Verify input validation exists on mcp parameterInspect the code path handling the mcp parameter for input validation functions such as escaping, encoding, or whitelist filteringAffected if No input validation or output encoding is found for the mcp parameter before it is reflected in HTTP responses
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Test for XSS vulnerability in mcp parameterSend a benign XSS probe payload (e.g., <script>alert(1)</script>) via the mcp parameter and inspect the HTTP response for unsanitized reflectionAffected if The payload is reflected without encoding or is executed when the response is rendered in a browser
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Check for compensating security controlsInspect HTTP response headers for Content-Security-Policy (CSP) with script-src restrictions, or verify that the application uses a modern framework with automatic XSS escaping for the relevant viewAffected if No CSP header is present and the framework does not provide automatic contextual encoding for the mcp parameter output
The environment is affected if next-ai-draw-io version 0.4.13 is running and the mcp parameter endpoint is accessible without proper input validation or output encoding on that parameter.
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 input validation and output encoding for the mcp parameter. Additionally, deploy Content Security Policy (CSP) headers to restrict script execution sources.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-50758 — 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-2026-50758 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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