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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-25449

CRITICAL · 9.8 CVSS v3.1 Published 2026-03-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable 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
Deserialization of Untrusted Data vulnerability in shinetheme Traveler traveler allows Object Injection.This issue affects Traveler: from n/a through < 3.2.8.1.

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 · high confidence

A deserialization of untrusted data vulnerability in the shinetheme Traveler WordPress theme allows remote attackers to inject PHP objects through unsafe deserialization. This object injection can lead to remote code execution, file operations, or other malicious activities depending on available magic methods and gadget chains in the application environment.

MitigationUpdate Traveler theme to version 3.2.8.1 or later to obtain the patched version. If immediate updating is not feasible, disable PHP deserialization functions and review the codebase for any user-input reaching unserialize() calls.

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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. Confirm Traveler theme installation
    Check the wp-content/themes/ directory for the 'traveler' folder, or view the themes list in WordPress admin under Appearance > Themes
    Affected if Traveler theme folder exists in the WordPress themes directory
  2. Identify installed version
    Open the style.css file in the theme folder (wp-content/themes/traveler/style.css) and locate the 'Version:' header, or check the version displayed in WordPress admin under Themes
    Affected if Version number is present and is below 3.2.8.1
  3. Locate unsafe deserialization code
    Search all PHP files in the theme folder for 'unserialize(' calls using grep or a code search tool: grep -r "unserialize(" wp-content/themes/traveler/
    Affected if Any unserialize() call is found that processes data without prior sanitization
  4. Identify data source for unserialize
    Examine the files containing unserialize() calls to trace whether the input comes from user-controlled sources such as $_GET, $_POST, $_REQUEST, or database fields
    Affected if User-supplied input (request parameters, cookies, or database content) reaches the unserialize() function without validation
  5. Verify endpoint accessibility
    Check if the file containing the vulnerable unserialize() call is accessible via direct HTTP request (check if it is a standalone PHP file or hooked into WordPress ajax/admin-ajax endpoints)
    Affected if The vulnerable code path can be reached by remote unauthenticated attackers through an HTTP request

A user is affected if the Traveler theme is installed with a version below 3.2.8.1 AND the theme contains unserialize() calls that process user-supplied input from accessible HTTP endpoints.

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

Update Traveler theme to version 3.2.8.1 or later to obtain the patched version. If immediate updating is not feasible, disable PHP deserialization functions and review the codebase for any user-input reaching unserialize() calls.

Recommended fix Moderate confidence

Traveler theme version 3.2.8.1 or later

  1. 1. Create a full backup of your WordPress site (database and files) before performing any updates.
  2. 2. Navigate to Appearance > Themes in the WordPress admin dashboard.
  3. 3. Locate the Traveler theme and check for an available update.
  4. 4. Update the Traveler theme to version 3.2.8.1 or later.
  5. 5. Verify the update was successful by checking the theme version in Appearance > Themes.
  6. 6. Test critical site functionality to ensure the update did not break existing features.

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

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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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-2026-25449 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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