CVE-2026-39436
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 · uneditedCross-Site Request Forgery (CSRF) vulnerability in bgermann CformsII allows Cross Site Request Forgery. This issue affects CformsII: from n/a through 15.1.3.
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 confidenceCross-Site Request Forgery (CSRF) vulnerability in the CformsII WordPress plugin allows an attacker to trick authenticated users into performing unintended actions by forcing their browser to send malicious requests. The lack of proper anti-CSRF tokens or validation in form submissions enables attackers to execute state-changing operations on behalf of victims who have active sessions.
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
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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 CformsII plugin is installedNavigate to WordPress admin dashboard under Plugins > Installed Plugins, or inspect the plugin directory at wp-content/plugins/ for a cformsII or similar cforms folder. Check the plugin header comment in the main PHP file for the version number.Affected if The plugin is present and the version cannot be confirmed to have CSRF protections.
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Identify exposed form endpointsReview the plugin source code for form definitions and submission handlers. Look for files containing form tags, submit buttons, or POST/GET request handlers that process user input. Common locations include the main plugin PHP file and any ajax-handling files.Affected if Form endpoints exist that accept user submissions without visible authentication barriers.
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Inspect admin forms for CSRF token fieldsView the HTML source of plugin admin pages where forms exist (such as settings or submission management pages). Search for hidden input fields containing tokens named类似 'csrf', 'token', 'nonce', or 'wpnonce'. Check if these fields are present in form markup.Affected if Form markup lacks hidden CSRF token or nonce fields in the HTML.
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Check form handler validation logicExamine PHP files that process form submissions. Look for calls to functions like wp_verify_nonce, check_ajax_referer, or custom validation routines that verify token presence before processing requests.Affected if Form processing code contains no server-side validation of CSRF tokens or nonces.
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Test form submission behaviorSubmit a form request (using curl or browser) to the plugin's action URL without including any token or nonce value. Observe whether the request is processed or rejected based on missing token validation.Affected if The request succeeds without a token, indicating missing CSRF protection.
The environment is affected if CformsII is installed and its form submissions lack server-side CSRF token validation or do not verify nonce values.
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 dataImplement anti-CSRF tokens (synchronizer token pattern) in all state-changing forms and verify SameSite cookie attributes and Referer/Origin headers. For WordPress plugins, add nonce verification to all form submissions and admin actions.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39436 — 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-2026-39436 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