dbcve.org
Cross-Site Request Forgery (CSRF)Weakness · CWE-352

CVE-2025-49342

HIGH · 7.1 CVSS v3.1 Published 2025-12-31
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable No privileges

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
Cross-Site Request Forgery (CSRF) vulnerability in merzedes Custom Style custom-style allows Stored XSS.This issue affects Custom Style: from n/a through <= 1.0.

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

Cross-Site Request Forgery (CSRF) vulnerability in merzedes Custom Style plugin allows attackers to inject malicious JavaScript through crafted requests, resulting in Stored XSS that executes when users view the affected content.

MitigationImplement anti-CSRF tokens on state-changing forms/requests and apply proper input validation and output encoding to prevent XSS execution.

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
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 checks

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

  1. Identify if merzedes Custom Style plugin is installed
    Check your CMS/plugin platform for the merzedes Custom Style plugin in the list of installed plugins or components. Look in the plugin directory or administration panel.
    Affected if The plugin is present in the installation
  2. Locate plugin-generated forms or input interfaces
    Navigate to the plugin settings or admin interface. Look for any forms that accept user input related to custom styling, CSS, or content that gets stored and displayed.
    Affected if Forms or input fields exist that store and display content
  3. Verify if stored content is rendered unsafely
    Inspect the plugin source code or use the plugin to store a test string containing HTML/script tags. View the stored content on the frontend to see if the tags execute or are properly escaped.
    Affected if Stored content renders HTML or JavaScript without encoding
  4. Check for missing CSRF protection on state-changing actions
    Review the plugin code for anti-CSRF token validation on POST/PUT requests that modify stored data. Look for nonce verification or token fields in forms that save custom style content.
    Affected if Forms that save data lack nonce or token verification

If the merzedes Custom Style plugin is installed and its forms for storing custom style content lack CSRF token validation and do not properly encode output, the environment is affected by this CVE.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement anti-CSRF tokens on state-changing forms/requests and apply proper input validation and output encoding to prevent XSS execution.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2025-49342 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2025-49342 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

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.

What belongs here
  • 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