Input validation error in Drupal - CVE-2026-55803
Published: June 18, 2026
Vulnerability identifier: #VU134794
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55803
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the PHP object injection issue. A remote user can execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Drupal
How to mitigate CVE-2026-55803
Install updates from vendor's website.
Drupal - addressed in versions 10.5.12, 10.6.11, 11.2.14, 11.3.12