CVE-2025-39551
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 · uneditedDeserialization of Untrusted Data vulnerability in Mahmudul Hasan Arif FluentBoards fluent-boards allows Object Injection.This issue affects FluentBoards: from n/a through <= 1.47.
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 confidenceFluentBoards versions through 1.47 contain a deserialization vulnerability where untrusted data is deserialized without proper validation, allowing an attacker to inject malicious objects. This type of flaw can lead to remote code execution or other serious impacts given the critical CVSS score of 9.8.
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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/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 FluentBoards installationLocate FluentBoards application files in your web root or application directory. Check for the presence of fluentboards-specific directories or files such as composer.json, config files, or the main application entry point.Affected if FluentBoards software is present in the environment
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Determine installed FluentBoards versionCheck the version by reviewing composer.json for the 'version' field, examining a VERSION file if present, or accessing the admin panel/version information page if available.Affected if The installed version is 1.47 or lower (through 1.47)
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Verify PHP deserialization is in useSearch the application source code for PHP deserialization functions such as unserialize(), file_get_contents() with deserialization, or any custom deserialization logic handling untrusted data.Affected if The application uses unserialize() or similar functions on untrusted input
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Check application configurationReview application configuration files for settings related to data import, serialization, or object handling that may accept and deserialize user-supplied data.Affected if Configuration allows deserialization of user-provided or external data without validation
If FluentBoards version 1.47 or lower is deployed and the application performs deserialization on untrusted data, the environment is vulnerable to CVE-2025-39551.
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 FluentBoards to the latest patched version. If no patch is available, review and sanitize all deserialization points in the application code, implement strict allowlist validation for deserialized objects, and consider disabling PHP deserialization functions if applicable.
- 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-2025-39551 — 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-2025-39551 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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