CVE-2026-39578
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 Valiance <= 1.2 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 Valiance CMS versions 1.2 and below allows remote attackers to inject malicious PHP objects through unserialization of untrusted input. This can lead to remote code execution if a suitable POP (Property Oriented Programming) chain exists within the application or its installed plugins.
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
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:H/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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Identify if Valiance CMS is installedLook for Valiance CMS signature files such as index.php with Valiance branding, admin/ login directory, or configuration files containing 'valiance' in the web root.Affected if The target application is running Valiance CMS.
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Determine the installed Valiance CMS versionLocate the version file or header in Valiance CMS. Typical locations include a version.php file, README, or the main index.php containing a version constant. Compare the version number to 1.2.Affected if The installed version is 1.2 or lower.
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Search for unserialize() calls in the codebaseGrep the web root for 'unserialize(' patterns in PHP files, particularly in entry points like index.php, form handlers, or API endpoints.Affected if The codebase contains unserialize() calls.
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Identify if unserialize() receives untrusted inputTrace the data flow from the unserialize() calls found. Check if the input originates from $_GET, $_POST, $_COOKIE, $_REQUEST, or file uploads without sanitization.Affected if Unserialize() processes data directly from user-supplied input without validation.
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Check for POP chain gadgets in the application or pluginsSearch for magic methods (__wakeup, __destruct, __call, __toString) in the application code and any installed plugins. These can form a POP chain when combined with the injection point.Affected if The application or its plugins contain exploitable POP chain gadgets that can be triggered via the object injection.
A user is affected if they run Valiance CMS version 1.2 or below with unserialize() processing untrusted input and an exploitable POP chain present in the codebase.
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 Valiance if available, or implement input validation to block unserialized data and disable unserialize() calls on untrusted input until a fix is released.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39578 — 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-2026-39578 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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