CVE-2026-40759
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 · uneditedUnauthenticated PHP Object Injection in Esmée <= 1.4 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 confidenceUnauthenticated PHP Object Injection vulnerability in Esmée CMS versions 1.4 and below. An attacker can exploit this by submitting crafted serialized PHP objects via an HTTP request without authentication, potentially triggering magic methods to achieve 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/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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Identify Esmée CMS versionLocate the version file or header in the CMS installation (commonly in a VERSION, config, or index file). Check the homepage or admin panel for version display, or inspect source code for version strings.Affected if Version is 1.4 or below (no patch version specified)
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Locate PHP unserialize() usageSearch the codebase for calls to unserialize() function, particularly in files handling HTTP request parameters (POST, GET, cookies, or headers). Use grep or a code search tool to find 'unserialize($_' patterns.Affected if The application calls unserialize() on data derived from unauthenticated HTTP requests
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Identify the vulnerable endpointExamine the PHP files that contain unserialize() calls. Determine which HTTP entry point (form, API endpoint, or route) passes user input to unserialize() without authentication checks.Affected if The unserialize() call can be reached without authentication (no login/session required)
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Check for magic method classesSearch for PHP classes with __wakeup, __destruct, __toString, or __call magic methods that could be autoloaded or instantiated through the deserialized object.Affected if Magic methods exist in the application that could be triggered via deserialized objects to achieve code execution
Running Esmée CMS version 1.4 or below with unserialize() processing unauthenticated HTTP input indicates the environment is vulnerable to CVE-2026-40759.
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 Esmée to version >1.4 if available; otherwise, disable PHP unserialize() usage, implement strict input validation, and consider deploying a WAF as a temporary measure.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-40759 — 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-2026-40759 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