CVE-2026-39498
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 · uneditedShop manager PHP Object Injection in YayMail <= 4.3.3 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 confidenceA PHP Object Injection vulnerability in the YayMail WordPress plugin (versions <= 4.3.3) allows authenticated users with Shop Manager privileges to inject malicious serialized PHP objects, potentially leading to remote code execution through 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/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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Verify YayMail plugin is installedCheck the WordPress plugins directory (wp-content/plugins/) for a folder named 'yaymail' or search for 'YayMail' in the WordPress admin plugin listAffected if The YayMail plugin is found in the installation
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Determine installed YayMail versionOpen the main YayMail plugin file (usually yaymail.php) and locate the 'Version' header in the plugin comment block, or check the readme.txt file for the 'Stable tag' valueAffected if The version number is 4.3.3 or lower
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Check for Shop Manager role presenceIn WordPress admin, navigate to Users > Roles, or use get_editable_roles() via WP-CLI (wp role list) to see if Shop Manager role existsAffected if The Shop Manager role is present in the WordPress installation
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Audit plugin code for unserialize usageSearch the YayMail plugin directory for calls to unserialize() function (grep -r 'unserialize' in the plugin folder), particularly those processing $_POST, $_GET, or user-supplied dataAffected if The plugin code contains unserialize() calls handling external input without validation
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Review recent user activity for Shop Manager accountsCheck WordPress user logs or access logs for activity from users with Shop Manager role, focusing on requests to YayMail admin pagesAffected if Active or recent logins by users assigned the Shop Manager role are found
If YayMail plugin version 4.3.3 or lower is installed AND the Shop Manager role exists with active users, and the plugin uses unserialize() on external input, the environment is vulnerable to CVE-2026-39498.
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.
dbcve · scopedUpdate YayMail to the latest version immediately. If no patched version is available, disable the plugin or restrict Shop Manager role capabilities until a fix is released.
YayMail latest version (4.3.4 or higher)
- 1. Verify the currently installed YayMail plugin version in WordPress admin under Plugins
- 2. Backup the WordPress site before making any changes
- 3. Navigate to Plugins > Installed Plugins in WordPress admin
- 4. Find YayMail in the plugin list
- 5. If the current version is 4.3.3 or lower, update the plugin to the latest available version
- 6. After updating, verify the new version number and test email sending functionality
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39498 — 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-2026-39498 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
- No spam, self-promotion, credentials, or personal data