CVE-2026-39471
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 · uneditedAuthor PHP Object Injection in ShortPixel Image Optimizer <= 6.4.3 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 · high confidenceThis is a PHP Object Injection vulnerability in the ShortPixel Image Optimizer WordPress plugin affecting versions 6.4.3 and below. The flaw allows an authenticated user with Author-level permissions or higher to inject malicious PHP objects through insecure deserialization, potentially leading to remote code execution.
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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Confirm ShortPixel Image Optimizer is installedNavigate to WordPress admin dashboard > Plugins and look for ShortPixel Image Optimizer in the list of installed plugins. Note whether it is active or inactive.Affected if The plugin is installed and active
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Check the installed plugin versionIn the Plugins list, click on ShortPixel Image Optimizer to view its details, or check the plugin header in the main plugin file for the version number. Compare this version to the affected range: 6.4.3 and below.Affected if The installed version is 6.4.3 or lower
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Identify users with Author-level or higher accessGo to WordPress admin > Users and review the role assigned to each user. Users with Author, Editor, or Administrator roles have the required permission level for exploitation.Affected if At least one user account has Author, Editor, or Administrator role
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Verify the plugin deserialization endpoint is accessibleReview the ShortPixel plugin files for any AJAX endpoints or forms that handle unserialize() calls on user-supplied data. Check if these endpoints are accessible to authenticated users with Author-level permissions.Affected if The plugin processes serialized data from authenticated users with Author-level permissions or higher
A user is affected if ShortPixel Image Optimizer version 6.4.3 or below is active on the WordPress site and at least one user account has Author-level or higher permissions.
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 ShortPixel Image Optimizer to the latest version immediately. Review user accounts with Author-level or higher permissions for suspicious activity and consider rotating sensitive credentials as a precaution.
ShortPixel Image Optimizer > 6.4.3 (latest available version)
- 1. Log in to your WordPress admin dashboard
- 2. Navigate to Plugins > Installed Plugins
- 3. Find ShortPixel Image Optimizer in the plugin list
- 4. If an update is available, click 'Update Now' to install the latest version
- 5. After updating, verify the plugin is running on a version newer than 6.4.3 by checking the plugin version number in the plugin details
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39471 — 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-2026-39471 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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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.
- 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