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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-32508

MEDIUM · 5.4 CVSS v3.1 Published 2026-03-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
60/100
Remediation priority · Elevated
Remotely reachable 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 Mikado-Themes Halstein halstein allows Object Injection.This issue affects Halstein: from n/a through < 1.8.

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 PHP Object Injection vulnerability exists in the Mikado-Themes Halstein theme due to unsafe deserialization of untrusted user input. The application uses PHP's unserialize() function on data from untrusted sources, allowing attackers to inject crafted PHP objects that can trigger magic methods (__wakeup, __destruct, etc.) to achieve code execution, file operations, or other malicious actions.

MitigationReplace unsafe deserialization (unserialize()) with safe alternatives like json_decode() for data storage, or implement a strict whitelist of allowed classes using the allowed_classes parameter if unserialize is absolutely required. Validate and sanitize all untrusted input before deserialization.

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
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 Halstein theme installation
    Locate the Mikado-Themes/Halstein theme files in the web root. Check directories like /wp-content/themes/halstein or similar theme folders. Look for theme definition files (style.css with Theme Name: Halstein, or theme.json).
    Affected if The Halstein theme by Mikado-Themes is installed on the system.
  2. Search for unsafe unserialize calls
    Grep the theme directory for PHP files containing 'unserialize(' - especially in form handlers, AJAX endpoints, or data processing files. Use: grep -r "unserialize" path/to/halstein/theme/
    Affected if Code contains unserialize() function calls without sanitization.
  3. Verify source of deserialized data
    Examine each unserialize() call to determine if the input comes from user-controlled sources like $_GET, $_POST, $_COOKIE, $_REQUEST, or database fields that may contain user-provided serialized data.
    Affected if The unserialize() function processes data from $_GET, $_POST, $_COOKIE, or other untrusted HTTP input without prior validation.
  4. Check for magic method presence
    Review theme PHP files for class definitions containing __wakeup, __destruct, __toString, __call, or __get magic methods that could be exploited for code execution or file operations.
    Affected if The codebase contains classes with magic methods that could be triggered via crafted serialized objects.
  5. Inspect input validation
    Look for any input validation, sanitization, or filtering logic before the unserialize() call. Check for functions like filter_var, preg_match, or custom validation routines.
    Affected if No validation exists between user input and the unserialize() call, or validation is insufficient.

The environment is affected if the Halstein theme is installed and contains unserialize() calls processing untrusted user input without proper validation or safe deserialization methods.

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

Replace unsafe deserialization (unserialize()) with safe alternatives like json_decode() for data storage, or implement a strict whitelist of allowed classes using the allowed_classes parameter if unserialize is absolutely required. Validate and sanitize all untrusted input before deserialization.

Recommended fix High confidence

Version 1.8 or later of the Mikado-Themes Halstein theme

  1. 1. Backup your WordPress site before making any changes.
  2. 2. Navigate to the WordPress admin dashboard.
  3. 3. Go to Appearance > Themes.
  4. 4. Locate the Halstein theme currently installed.
  5. 5. Check the current version number of the Halstein theme.
  6. 6. If the installed version is below 1.8, update the theme to version 1.8 or later.
  7. 7. Verify the update was successful by confirming the new version number.

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

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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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-2026-32508 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
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  • Version or environment caveats, and links to real fixes
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