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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2025-47292

CRITICAL · 9.5 CVSS v4.0 Published 2025-05-14
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

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 · unedited
Cap Collectif is an online decision making platform that integrates several tools. Before commit 812f2a7d271b76deab1175bdaf2be0b8102dd198, the `DebateAlternateArgumentsResolver` deserializes a `Cursor`, allowing any classes and which can be controlled by unauthenticated user. Exploitation of this vulnerability can lead to Remote Code Execution. The vulnerability is fixed in commit 812f2a7d271b76deab1175bdaf2be0b8102dd198.

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
How this class of weakness works · CWE-502

The application rebuilds objects from attacker-supplied serialized data, and the act of rebuilding can trigger dangerous code paths. In many runtimes this leads straight to remote code execution. The durable fix is to avoid deserializing untrusted input — or to use a strict, type-limited format with integrity checks.

General guidance for the deserialization of untrusted data class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence
  1. 1. Navigate to the Cap Collectif application codebase
  2. 2. Locate the DebateAlternateArgumentsResolver file (likely in src/ or similar directory)
  3. 3. Identify the code that deserializes the Cursor object using unserialize() or similar PHP deserialization functions
  4. 4. Replace unsafe deserialization with safe alternatives such as: JSON decoding with json_decode() if JSON data is expected, or implementing allowlist-based type checking if PHP object hydration is truly required
  5. 5. If the Cursor class requires specific object instantiation, create the object through a controlled factory method rather than uncontrolled deserialization
  6. 6. Verify no other similar unsafe deserialization patterns exist in the codebase related to user-controlled input
  7. 7. Apply the fix from commit 812f2a7d271b76deab1175bdaf2be0b8102dd198 or implement equivalent secure deserialization logic
  8. 8. Test the DebateAlternateArgumentsResolver functionality to ensure the fix doesn't break legitimate features
Caveat The fix may require changes to how Cursor data is passed/serialized between requests; ensure any API consumers are updated to use the new format (e.g., JSON instead of PHP serialization)

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

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