CVE-2026-4548
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 · uneditedA vulnerability was detected in mickasmt next-saas-stripe-starter 1.0.0. Affected by this vulnerability is the function updateUserrole of the file actions/update-user-role.ts. The manipulation of the argument userId/role results in improper authorization. The attack may be launched remotely.
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 confidenceThe updateUserrole function in actions/update-user-role.ts of the next-saas-stripe-starter template lacks proper authorization checks, allowing authenticated users to manipulate the userId and role arguments to escalate privileges or modify other users' roles without appropriate permissions.
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
- 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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Locate the vulnerable fileSearch the codebase for the file actions/update-user-role.ts from the next-saas-stripe-starter templateAffected if The file exists in the project and is being used for user role management
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Examine the updateUserrole functionOpen actions/update-user-role.ts and locate the updateUserrole or updateUserRole function definitionAffected if The function exists and handles role modifications for users
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Check for authorization logicInspect the function body to see if there are any permission checks (such as verifying admin status, checking session, or validating caller privileges) before allowing role changesAffected if No authorization or permission verification code is present before the role modification logic
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Verify input validationLook for validation of the userId and role parameters to ensure they are properly sanitized and the target user existsAffected if The userId and role arguments are used directly without validation that the caller has rights to modify that specific user
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Test with non-admin accountIf the code is running, attempt to call the updateUserrole function with an authenticated but non-administrative user account, providing a different userId and elevated roleAffected if The role modification succeeds without proper authorization errors
If the update-user-role.ts file exists and the updateUserrole function lacks authorization checks before modifying user roles, the environment is affected by this privilege escalation vulnerability.
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 proper authorization checks in the updateUserrole function to verify the caller has administrative privileges before allowing role modifications, and validate that the target user exists and the requested role is valid.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-4548 — 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-2026-4548 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
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- Version or environment caveats, and links to real fixes
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