Critical · CVSS 9.3CVE-2026-56700

Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command InjectionCVE-2026-56700

Answer in brief

CVE-2026-56700 records a Critical severity (CVSS 9.3) vulnerability in Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command Injection. The current sources do not mark it as known exploited. The current feed maps Grav/Grav (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 30, 2026Updated Oct 8, 2026Source checked Oct 8, 2026First seen by HOL Jul 1, 2026Material review Oct 8, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Grav/Grav (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Grav/Gravgeneric	>=0 <2.0.0-beta.2	2.0.0-beta.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for Grav/Grav.
Review the reported fix. Update Grav/Grav to 2.0.0-beta.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 1, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.