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Improper Input ValidationWeakness · CWE-20

CVE-2025-55301

MEDIUM · 6.7 CVSS v3.1 Published 2025-08-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
72/100
Remediation priority · Elevated
No privileges Zero-click

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 · unedited
The Scratch Channel is a news website. In version 1, it is possible to go to application in devtools and click local storage to edit the account's username locally. This issue has been patched in version 1.1.

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 confidence

This is a client-side vulnerability where user data stored in browser local storage can be directly manipulated via developer tools to modify the account username locally. The application trusts client-side local storage for account information without proper server-side validation, allowing attackers to alter their displayed username.

MitigationUpgrade to version 1.1 which implements server-side validation and does not trust client-side local storage for account data. Additionally, implement integrity checks on client-side data and validate all user input server-side.

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
Local
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

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 checks

Work through these to decide whether this CVE applies to you.

  1. Inspect local storage for account data
    Open browser developer tools (F12), navigate to the Application or Storage tab, and examine localStorage/sessionStorage for any keys containing user account information such as usernames, display names, or user profile data
    Affected if Local storage contains username or display name fields that can be directly edited
  2. Verify if username changes persist after modification
    In browser developer tools, locate the stored username field in local storage, manually modify the value to a different name, refresh the application, and observe whether the modified username is displayed by the application without server validation
    Affected if The application displays the locally modified username without re-fetching or validating it server-side
  3. Check for server-side validation on client-side data
    Use network inspection in developer tools to monitor API calls when the application loads; verify whether the application queries the server for current user profile data or relies solely on local storage values
    Affected if The application does not make API calls to fetch fresh user data on load and relies on local storage alone for the displayed username
  4. Determine application version
    Check the application's version information typically found in the about page, footer, settings, or by inspecting the JavaScript bundle for version strings; compare against the fixed version 1.1
    Affected if The installed version is below 1.1 and lacks server-side validation for local storage data
  5. Review network requests for username validation
    When changing the username through the UI, use the network tab to capture the request; examine whether the server returns the validated username or accepts any value sent by the client without verification
    Affected if The server accepts and returns the username sent by the client without cross-referencing against authoritative user records

A user is affected if their application stores account usernames in local storage and displays them without server-side validation, allowing the displayed name to be arbitrarily changed via browser developer tools.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to version 1.1 which implements server-side validation and does not trust client-side local storage for account data. Additionally, implement integrity checks on client-side data and validate all user input server-side.

Recommended fix Moderate confidence

version 1.1

  1. Obtain version 1.1 of the Scratch Channel application
  2. Upgrade the Scratch Channel installation from version 1 to version 1.1
  3. Verify that client-side local storage modifications to username are no longer trusted by the server

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,400
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-55301 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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