dbcve.org
Pdf Editor CloudApplication · Foxit

CVE-2025-66502

MEDIUM · 5.4 CVSS v3.1 Published 2025-12-19
Fix available
A fix is available. Upgrade to 2025-12-01 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

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
A stored cross-site scripting (XSS) vulnerability exists in pdfonline.foxit.com within the Page Templates feature. A crafted payload can be stored as the template name, which is later rendered into the DOM without proper sanitization. As a result, the injected script executes each time the affected PDF is loaded.

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

A stored XSS vulnerability exists in pdfonline.foxit.com's Page Templates feature where malicious JavaScript can be embedded in a template name. When the affected PDF is loaded, the unsanitized template name is rendered into the DOM, causing the injected script to execute persistently.

MitigationImplement input validation and output encoding on all template names before rendering them in the DOM. Use context-aware escaping (HTML entity encoding for HTML content) to prevent script execution.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Pdf Editor CloudApplication
Affected:< 2025-12-01

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
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

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

  1. Confirm Foxit Pdf Editor Cloud usage
    Log into your pdfonline.foxit.com account and verify you are using the Foxit Pdf Editor Cloud service. Check the account dashboard or subscription details to confirm the service in use.
    Affected if You are actively using Foxit Pdf Editor Cloud as your PDF editing platform
  2. Check the service version
    Access the version information for your Foxit Pdf Editor Cloud instance. This may be found in the account settings, about section, or the service dashboard. Compare the version date to the cutoff date of 2025-12-01.
    Affected if The version or build date is earlier than December 1, 2025 (version < 2025-12-01)
  3. Verify Page Templates feature access
    Navigate to the Page Templates feature within the pdfonline.foxit.com interface. Look for the template management section where you can create, edit, or view PDF page templates.
    Affected if The Page Templates feature is accessible and has been used to create or import templates
  4. Inspect template names for script content
    In the Page Templates section, review all saved template names. Look for any templates with unusual characters, HTML tags, or JavaScript-like syntax in their names (e.g., <script>, javascript:, onerror=, onload=, alert(, etc.).
    Affected if Any template name contains HTML tags, JavaScript event handlers, or script-related syntax that was not intentionally encoded by the user

You are affected if you use Foxit Pdf Editor Cloud with a version predating December 1, 2025 and have used the Page Templates feature where template names may contain unsanitized user-supplied content.

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
Upgrade available Upgrade to 2025-12-01 or later
Fixed in 2025-12-01
Interim mitigation

Implement input validation and output encoding on all template names before rendering them in the DOM. Use context-aware escaping (HTML entity encoding for HTML content) to prevent script execution.

Recommended fix Moderate confidence

Pdf Editor Cloud 2025-12-01 or later

  1. 1. Identify all users or integrations accessing pdfonline.foxit.com
  2. 2. Verify the currently deployed Pdf Editor Cloud version is earlier than 2025-12-01
  3. 3. Upgrade Pdf Editor Cloud to version 2025-12-01 or later through the vendor's update mechanism
  4. 4. Confirm the upgrade was successful by checking the version information in the admin console or about section
  5. 5. Validate the fix by creating a test template with a benign payload (e.g., <script>console.log('test')</script>) in the template name field and verifying it is properly encoded/escaped when rendered in the DOM

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

Fix this in Pdf Editor Cloud Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2025-66502 in production — separate from our analysis above.

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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