Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command Injection

published 2026-05-05 6 mo ago modified 2026-10-08 32 d ago also EUVD-2026-40452 , GHSA-vj3m-2g9h-vm4p

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.5%; EPSS 2.5% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in Scheduler\JobQueue, Framework\Cache\Adapter\FileCache, and Session - deserialize untrusted data without restricting allowed classes, enabling PHP object injection and, via a gadget chain, arbitrary code execution where an attacker controls the serialized input. Additionally, InstallCommand's git clone operation passes the branch, url, and path parameters into a shell command without escaping, allowing OS command injection via plugin/theme installation (which requires admin access). A Twig security blocklist bypass (server-side template injection) is also present. The issues are fixed in 2.0.0-beta.2.

Patch / fix

fixed in 2 links 1

packagist getgrav/grav 2.0.0-beta.2
Grav Grav 2.0.0-beta.2

github.com/getgrav/grav@5a12f9b commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 4 mo ago (2026-07-01)

Exploit prediction

2.53% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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

Affected packages

ecosystem	package	affected	fixed in
packagist	getgrav/grav	<2.0.0-beta.2	2.0.0-beta.2

Affected products

Grav Grav

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command
CWE-502 Deserialization of Untrusted Data

References

github.com /getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
web
github.com /getgrav/grav/security/advisories/GHSA-vj3m-2g9h-vm4p
vendor-advisory, web
vulncheck.com /advisories/grav-multiple-remote-code-execution-vulnerabilities-via-unsafe-unserialize-and-command-injection
third-party-advisory
github.com /getgrav/grav
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary