CVE-2026-40733
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 ShiftUp <= 1.3 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 · moderate confidenceUnauthenticated PHP Object Injection vulnerability in ShiftUp versions 1.3 and earlier allows remote attackers to inject malicious PHP objects via unsafe deserialization, potentially leading to remote code execution without requiring valid credentials.
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 ShiftUp installationLocate ShiftUp files in the web root or application directory. Look for directories named 'shiftup', 'ShiftUp', or files containing 'ShiftUp' branding or copyright notices.Affected if ShiftUp is not present on the system
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Determine installed ShiftUp versionCheck version file or code constants. Common locations: version.php, config.php, or a VERSION file in the root directory. Look for a variable like $version, VERSION, or similar.Affected if Version is 1.3 or lower
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Locate unsafe deserialization callsSearch codebase for 'unserialize(' function calls. In PHP files, grep for 'unserialize' to find where deserialization occurs.Affected if unserialize() calls are present in the code
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Check if user input reaches unserializeTrace the data flow from HTTP request parameters (GET, POST, COOKIE) to unserialize() calls. Review how user-supplied data is handled before deserialization.Affected if User-controlled input is passed directly to unserialize() without validation
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Verify authentication is not enforced on vulnerable endpointReview access controls on the script(s) containing unserialize() calls. Check if the PHP files include authentication checks before deserialization occurs.Affected if The unserialize() endpoint is accessible without authentication
User is affected if ShiftUp version 1.3 or earlier is installed AND the application contains unserialize() calls that process untrusted input without authentication or validation.
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 ShiftUp to a version newer than 1.3. Additionally, avoid using unserialize() with untrusted input and implement whitelist-based validation for any deserialized data.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-40733 — 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-2026-40733 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
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