CVE-2026-3891
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 · uneditedThe Pix for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check and missing file type validation in the 'lkn_pix_for_woocommerce_c6_save_settings' function in all versions up to, and including, 1.5.0. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
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 confidenceThe Pix for WooCommerce plugin for WordPress fails to enforce authorization and file type validation in the lkn_pix_for_woocommerce_c6_save_settings function, allowing unauthenticated attackers to upload arbitrary files including executable code to the server.
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 checksWork through these to decide whether this CVE applies to you.
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Verify Pix for WooCommerce plugin is installedIn WordPress admin, go to Plugins > Installed Plugins and look for 'Pix for WooCommerce' or check wp-content/plugins/ directory for pix-for-woocommerce folderAffected if Plugin is not installed means not affected, but if installed continue to version check
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Check installed plugin versionIn WordPress admin Plugins list, find Pix for WooCommerce and note the version number displayed below the plugin nameAffected if Version is below 1.5.1 (e.g., 1.5.0 or earlier) means the vulnerability is present
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Verify the vulnerable settings endpoint existsCheck if the file wp-content/plugins/pix-for-woocommerce/includes/settings/c6-settings.php exists and contains the lkn_pix_for_woocommerce_c6_save_settings functionAffected if File exists with that function and plugin version is below 1.5.1 means the unauthenticated file upload is possible
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Inspect upload directories for suspicious filesCheck wp-content/uploads/ and subdirectories for newly created PHP files or files with double extensions (e.g., image.php.jpg) that were not intentionally uploadedAffected if Unexpected PHP files or executable scripts found in upload directories may indicate successful exploitation
If Pix for WooCommerce plugin version is 1.5.0 or below, the environment is vulnerable to unauthenticated arbitrary file upload via the lkn_pix_for_woocommerce_c6_save_settings function.
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.
From vendor dataUpgrade to version 1.5.1 or later which includes capability checks and file type validation. If immediate upgrade is not possible, disable the plugin or restrict access to the affected endpoint via web server configuration.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-3891 — 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-2026-3891 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