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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-49106

CRITICAL · 9.8 CVSS v3.1 Published 2026-06-15
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
Unauthenticated PHP Object Injection in Integration for Contact Form 7 and Constant Contact <= 1.1.6 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 in the Integration for Contact Form 7 and Constant Contact WordPress plugin allows remote attackers to inject malicious PHP objects via untrusted input passed to PHP's unserialize() function, potentially leading to arbitrary code execution.

MitigationUpgrade to version 1.1.7 or later; alternatively, disable the plugin until a patch is applied. If immediate patching is not possible, consider web application firewall rules to block serialized object payloads.

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. Identify if the plugin is installed
    In the WordPress admin dashboard, go to Plugins > Installed Plugins and look for 'Integration for Contact Form 7 and Constant Contact', or check the /wp-content/plugins/ directory for a folder containing 'contact-form-7' and 'constant-contact' in the name
    Affected if The plugin is present on the WordPress site
  2. Determine the installed plugin version
    In the WordPress admin, click on the plugin name to view its details, or open the main plugin PHP file and look for the 'Version' header in the plugin comment block
    Affected if The version number is lower than 1.1.7
  3. Verify the vulnerability is exploitable
    Since this is an unauthenticated PHP Object Injection via unserialize(), check if the plugin's form submission endpoints are publicly accessible (no login required) - the vulnerability triggers when the plugin processes CF7 form submissions sent to Constant Contact
    Affected if The plugin is active and publicly accessible form endpoints exist without authentication requirements

The environment is affected if the Integration for Contact Form 7 and Constant Contact plugin is installed and the installed version is below 1.1.7.

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 to version 1.1.7 or later; alternatively, disable the plugin until a patch is applied. If immediate patching is not possible, consider web application firewall rules to block serialized object payloads.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2026-49106 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