CVE-2025-54001
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 · uneditedDeserialization of Untrusted Data vulnerability in ThemeREX Classter classter allows Object Injection.This issue affects Classter: from n/a through <= 2.5.
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 confidenceA PHP Object Injection vulnerability exists in the ThemeREX Classter WordPress theme (versions <= 2.5) due to unsafe deserialization of untrusted data. The vulnerability allows attackers to inject malicious PHP objects, potentially leading to remote code execution if suitable 'gadget chains' exist within the application or loaded libraries.
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 checksWork through these to decide whether this CVE applies to you.
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Confirm ThemeREX Classter theme is installedNavigate to wp-content/themes/ and check for a folder named 'classter' or 'trx_classter'. Alternatively, go to WordPress Admin > Appearance > Themes and verify the Classter theme is active or installed.Affected if The ThemeREX Classter theme is present in the WordPress installation.
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Determine the installed theme versionCheck the style.css file in the theme folder for the 'Version:' header, or view the theme details in WordPress Admin > Appearance > Themes. Compare the version number to the affected range (versions <= 2.5).Affected if The installed version is 2.5 or lower.
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Locate unsafe unserialize() calls in theme filesSearch the theme directory for PHP files containing 'unserialize(' by using a command like 'grep -r "unserialize(" wp-content/themes/classter/' or a file content search tool. Examine the context of each occurrence to determine if untrusted user input is passed to unserialize().Affected if The theme contains unserialize() calls that process data from user input (e.g., $_GET, $_POST, $_COOKIE, or database values that can be controlled by users).
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Identify potential gadget chainsSearch for class definitions within the theme and any bundled libraries that might be used as gadget chains. Look for magic methods like __wakeup, __destruct, __toString, or __call that could be chained to achieve code execution. Review loaded Composer or other library dependencies.Affected if The application contains classes with exploitable magic methods that could form a gadget chain for object injection.
A user is affected if the ThemeREX Classter theme version is 2.5 or lower AND the theme uses unserialize() on untrusted user-controlled data with exploitable gadget chains present in the codebase.
Generated from the published advisory. Verify against your own configuration.
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 dataReplace any unsafe unserialize() calls with secure alternatives like json_decode() for data that originates from user input, implement strict input validation, and update to a patched version if available from ThemeREX.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-54001 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-54001 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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