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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-40756

HIGH · 8.1 CVSS v3.1 Published 2026-06-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
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
Unauthenticated PHP Object Injection in Zoya <= 1.4 versions.

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

Unauthenticated PHP Object Injection vulnerability in Zoya CMS versions 1.4 and below allows remote attackers to inject malicious PHP objects via untrusted input passed to PHP's unserialize() function, potentially leading to remote code execution.

MitigationUpgrade Zoya to a patched version if available, or audit and disable any code paths that accept untrusted serialized data without proper validation.

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/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 Zoya CMS is installed
    Search for Zoya CMS files in the web root directory. Look for typical Zoya installation directories or files containing 'zoya' in the name.
    Affected if Zoya CMS files are present on the server
  2. Identify the installed Zoya version
    Locate and read the version file or changelog typically found in the CMS root (common paths include version.php, CHANGELOG.md, or a config file with a version directive). Compare the version number to 1.4.
    Affected if The installed version is 1.4 or lower
  3. Locate unserialize() calls handling user input
    Search the codebase for unserialize() function calls, particularly in files that process request parameters, cookies, or POST/GET data. Review the surrounding code to determine if input sources are user-controlled.
    Affected if unserialize() calls exist that process data from unauthenticated user sources without prior sanitization
  4. Verify the vulnerable input pathway is exposed
    Identify the specific code path that accepts unserialize() input. Determine if the endpoint or parameter is accessible without authentication by checking for missing session validation, login checks, or access controls on the relevant script.
    Affected if The unserialize() handling code is reachable without authentication

You are affected if Zoya CMS version 1.4 or lower is installed AND your codebase contains unserialize() calls processing unauthenticated user input through an accessible endpoint.

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

Upgrade Zoya to a patched version if available, or audit and disable any code paths that accept untrusted serialized data without proper validation.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,390
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.

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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-2026-40756 in production — separate from our analysis above.

No notes yet

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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
  • 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