CVE-2026-40755
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 TechLink <= 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 confidenceThis is an unauthenticated PHP Object Injection vulnerability in TechLink version 1.3 and earlier. PHP Object Injection occurs when untrusted serialized data is deserialized without proper validation, potentially allowing attackers to manipulate PHP object instantiation to achieve code execution, file operations, or other malicious actions depending on available 'gadget chains' in the application and its libraries.
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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Locate TechLink installation and determine versionSearch web root directories for TechLink folder, then check version.php, README, or composer.json for version numberAffected if Installed version is 1.3 or lower, or version cannot be determined but TechLink is present
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Identify PHP files containing deserialization functionsSearch the codebase for 'unserialize' function calls using grep or similar: grep -r "unserialize" /path/to/techlink/Affected if Any unserialize() calls exist that process input without validation
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Verify if user input reaches deserializationReview the unserialize() calls found and trace whether $_GET, $_POST, $_COOKIE, or similar user-supplied data is passed to themAffected if User-controlled data is passed directly to unserialize() without sanitization
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Check for exposed endpoints accepting serialized dataReview routing files and form handlers to identify endpoints that accept and process serialized PHP data from requestsAffected if Endpoints accept serialized data from unauthenticated users
If TechLink version 1.3 or below is installed AND the application contains unserialize() calls processing unauthenticated user input, the environment is affected by this vulnerability.
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 a patched version of TechLink if available; otherwise, disable PHP deserialization of user input, implement strict whitelist-based input validation, and consider deploying a WAF as a temporary compensating control.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-40755 — 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-2026-40755 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