CVE-2026-10833
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 Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'configurablePrefix' Block Attribute in all versions up to, and including, 6.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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 Gutenberg Essential Blocks WordPress plugin fails to properly sanitize the 'configurablePrefix' block attribute and escape it on output, allowing authenticated users with Contributor-level permissions or higher to inject persistent malicious JavaScript that executes when other users view affected pages.
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
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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 Gutenberg Essential Blocks plugin is installedIn WordPress admin, go to Plugins > Installed Plugins and locate 'Gutenberg Essential Blocks' in the list. Alternatively, check the /wp-content/plugins/essential-blocks directory exists on the server.Affected if The plugin is present in the WordPress installation
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Identify the installed plugin versionIn the WordPress plugin list, click on the plugin name to view details, or check the main plugin file (e.g., essential-blocks.php) for the 'Version' header comment. Compare this version number to 6.1.4.Affected if The installed version is 6.1.4 or earlier
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Verify contributor-level or higher user accounts existNavigate to Users > All Users in the WordPress admin. Review the role column for accounts assigned Contributor, Author, Editor, or Administrator roles.Affected if At least one user account has Contributor-level permissions or higher AND the plugin is vulnerable
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Identify blocks using the configurablePrefix attributeSearch the WordPress database or post content for blocks containing 'configurablePrefix' in their attributes. This may require querying the wp_posts table or using a plugin that inspects block JSON.Affected if Content blocks with the configurablePrefix attribute exist AND the plugin version is vulnerable
The environment is affected if Gutenberg Essential Blocks version 6.1.4 or earlier is installed and active, combined with the presence of Contributor-level users and use of blocks that utilize the configurablePrefix attribute.
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 dataUpdate the Gutenberg Essential Blocks plugin to a version beyond 6.1.4; alternatively, restrict contributor-level user permissions or disable the plugin until a patched version is available.
- Consultation2.0 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 $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-10833 — 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-2026-10833 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