Deserialization of Untrusted Data in Drupal - CVE-2026-55804
Published: June 18, 2026
Vulnerability identifier: #VU134795
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55804
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Drupal
Affected software:
Drupal
Drupal
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to the Gadget chain issue when processing serialized data. A remote administrator can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2026-55804
Install updates from vendor's website.