dbcve.org
Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-25429

CRITICAL · 9.8 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 →
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 wpdive Nexa Blocks nexa-blocks allows Object Injection.This issue affects Nexa Blocks: from n/a through <= 1.1.1.

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 · moderate confidence

A deserialization of untrusted data vulnerability in the Nexa Blocks WordPress plugin allows remote attackers to inject malicious PHP objects, potentially leading to remote code execution via PHP object injection.

MitigationUpdate Nexa Blocks to the latest patched version immediately; if no patched version is available, disable the plugin and deploy a WAF rule to block deserialization attacks.

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 Nexa Blocks plugin is installed
    Check the WordPress plugins directory (wp-content/plugins/) for the nexa-blocks folder, or query the wp_options table for 'active_plugins' to see if Nexa Blocks is enabled.
    Affected if The plugin folder exists and the plugin is active in WordPress.
  2. Identify installed Nexa Blocks version
    Open the main plugin file (usually nexa-blocks.php) in the plugin directory and locate the 'Version' header comment, or check the WordPress plugin admin page for the installed version number.
    Affected if The version number is 1.1.1 or lower.
  3. Review plugin data handling endpoints
    Examine plugin PHP files for calls to unserialize() function, particularly any that process data from user requests (GET, POST, COOKIE, or REST API parameters).
    Affected if The plugin contains unserialize() calls that process untrusted input without prior validation.
  4. Inspect server access logs for exploitation signatures
    Search HTTP logs for requests to the Nexa Blocks plugin paths containing serialized PHP objects (look for patterns like 'O:', 'a:', or base64-encoded serialized payloads).
    Affected if Suspicious requests with serialized data are found targeting the plugin.

Your environment is affected if the Nexa Blocks plugin is installed, active, and running version 1.1.1 or lower, with the deserialization functionality accessible to unauthenticated users.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update Nexa Blocks to the latest patched version immediately; if no patched version is available, disable the plugin and deploy a WAF rule to block deserialization attacks.

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2026-25429 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2026-25429 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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