Deserialization of Untrusted Data in Grav CMS - #VU130081
Published: May 5, 2026
Vulnerability identifier: #VU130081
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Grav CMS
Affected software:
Grav CMS
Grav CMS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in Session flash object handling when processing session data. A remote attacker can provide crafted serialized session content to execute arbitrary code.
Session storage is typically more restricted than the other deserialization vectors.
Remediation
Install security update from vendor's website.