CVE-2025-26763
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 MetaSlider Responsive Slider by MetaSlider ml-slider allows Object Injection.This issue affects Responsive Slider by MetaSlider: from n/a through <= 3.94.0.
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 · high confidenceThe MetaSlider WordPress plugin (ml-slider) versions through 3.94.0 contain a PHP Object Injection vulnerability via unsafe deserialization of untrusted data. An unauthenticated remote attacker can exploit this by sending crafted serialized PHP objects to the plugin, potentially achieving arbitrary code execution if a suitable POP chain exists within the application or installed plugins.
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 MetaSlider plugin is installedNavigate to WordPress admin > Plugins and check if 'MetaSlider' (ml-slider) appears in the installed plugins listAffected if MetaSlider plugin is present in the WordPress installation
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Identify installed MetaSlider versionIn WordPress admin > Plugins, locate MetaSlider and read the version number displayed beneath the plugin name, or check the version in the plugin header file (ml-slider/ml-slider.php) via file manager or FTPAffected if The installed version is 3.94.0 or lower (any version through 3.94.0 is affected)
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Verify the vulnerable deserialization endpoint is accessibleCheck plugin settings or network traffic to identify if the plugin processes serialized data via AJAX actions or front-end endpoints. Review plugin PHP files for calls to unserialize() on user-supplied input, particularly in files like inc/metaslider.class.php or similar handler filesAffected if The plugin processes untrusted serialized PHP data without validation (unserialize() is called on input from HTTP requests)
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Audit for suspicious PHP object injection artifactsReview WordPress access logs for unusual POST requests to /wp-admin/admin-ajax.php or plugin endpoints containing serialized PHP patterns (like O: or a:). Check for unexpected new files in wp-content/uploads or plugin directories that may indicate exploitation attemptsAffected if Logs show serialized PHP payloads being sent to the site, or unexpected PHP files appear after the vulnerability disclosure date
A user is affected if MetaSlider (ml-slider) version 3.94.0 or lower is installed AND the plugin processes untrusted serialized PHP data, as an unauthenticated attacker can inject arbitrary PHP objects to achieve code execution.
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 dataUpdate MetaSlider to the latest patched version immediately. If patching is not feasible, disable the plugin until an update is available, as the CVSS 9.8 score indicates critical exploitable conditions.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-26763 — 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-2025-26763 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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- 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
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