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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2025-49869

HIGH · 8.8 CVSS v3.1 Published 2025-08-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable 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 Arraytics Eventin wp-event-solution allows Object Injection.This issue affects Eventin: from n/a through <= 4.0.31.

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 Eventin (wp-event-solution) WordPress plugin allows attackers to inject PHP objects via unsafe use of PHP's unserialize() function. This can lead to remote code execution, file manipulation, or other attacks through magic methods in PHP objects.

MitigationUpdate Eventin plugin to the latest patched version once released; alternatively, replace unsafe unserialize() calls with json_decode() and implement strict input validation on any user-supplied data before deserialization.

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

CVSS:3.1/AV:N/AC:L/PR:L/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. Verify Eventin plugin is installed
    Check for the wp-event-solution plugin directory in wp-content/plugins/ or view installed plugins in WordPress admin under Plugins > Installed Plugins
    Affected if The plugin is present in the WordPress installation
  2. Determine installed Eventin version
    Locate the main plugin PHP file (typically wp-event-solution.php) and check the 'Version' header comment, or find the version in the plugin's readme.txt file
    Affected if Version is 4.0.31 or lower (any version through 4.0.31 is affected)
  3. Confirm plugin is active
    Check WordPress admin under Plugins > Installed Plugins to see if Eventin plugin status shows 'Active'
    Affected if Plugin is active and processing requests
  4. Verify deserialization handling exists
    Inspect plugin code for unserialize() calls without proper sanitization, particularly in AJAX endpoints or public-facing PHP files within the plugin directory
    Affected if The plugin code contains insecure unserialize() calls handling user-supplied data

User is affected if Eventin plugin version 4.0.31 or lower is installed and active in WordPress, as the plugin contains insecure deserialization logic that could process malicious serialized PHP objects.

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 Eventin plugin to the latest patched version once released; alternatively, replace unsafe unserialize() calls with json_decode() and implement strict input validation on any user-supplied data before deserialization.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2025-49869 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
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