CVE-2019-6340

Status: AnalyzedHigh (8.1)⚠ Active exploitation💥 Exploit

Some field types do not properly sanitize data from non-form sources in Drupal 8.5.x before 8.5.11 and Drupal 8.6.x before 8.6.10. This can lead to arbitrary PHP code execution in some cases. A site is only affected by this if one of the following conditions is met: The site has the Drupal 8 core RESTful Web Services (rest) module enabled and allows PATCH or POST requests, or the site has another web services module enabled, like JSON:API in Drupal 8, or Services or RESTful Web Services in Drupal 7. (Note: The Drupal 7 Services module itself does not require an update at this time, but you should apply other contributed updates associated with this advisory if Services is in use.)

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 8.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 92%
Percentile among all scored CVEs: 100
Score date: 10/7/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Added to catalog: 3/25/2022
Remediation due date: 4/15/2022
Known ransomware use: Unknown

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Metasploit module (reliable, widely available exploit) · Drupal RESTful Web Services unserialize() RCE
Published on Exploit-DB · Drupal < 8.5.11 / < 8.6.10 - RESTful Web Services unserialize() Remote Command Execution (Metasploit) (3/7/2019)
Published on Exploit-DB · Drupal < 8.6.9 - REST Module Remote Code Execution (2/25/2019)
Published on Exploit-DB · Drupal < 8.6.10 / < 8.5.11 - REST Module Remote Code Execution (2/23/2019)
Nuclei template (automated mass detection) · Drupal - Remote Code Execution
Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access90 %
Primary impactT1059 Command and Scripting Interpreterexecution85 %
Secondary impactT1565.001 Stored Data Manipulationimpact70 %

Vulnerabilidad de deserialización insegura (CWE-502) en servicios REST/JSON:API de Drupal sin autenticación (AV:N, PR:N), permitiendo ejecución remota de código PHP mediante PATCH/POST. KEV activo confirma explotación real en campo.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Restrict File and Directory Permissions Remote Data Storage Network Segmentation

Affected technologies (1)

Drupal — Drupal

CWEs

CWE-502
CWE-502

References

Raw JSON (NVD)

Show

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