CVE-2026-56700Public exploitNetwork attack vectorHinoki check available

Code execution via unsafe deserialization and shell injection

Published Jun 30, 2026 · Updated Oct 8, 2026

Code execution flaws in Grav CMS before 2.0.0-beta.2 allow attackers to execute arbitrary code via crafted stored data or templates. JobQueue, FileCache, and Session deserialize data without class restrictions or integrity checks; InstallCommand leaves git-clone arguments unescaped, and cleanDangerousTwig omits callable helpers from its blocklist. Exploitation requires control of serialized storage or Twig content, or admin access for installation; FileCache is not the default cache adapter.

CVSS severity9.3
Critical
EPSS probability2.53%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code execution flaws in Grav CMS before 2.0.0-beta.2 allow attackers to execute arbitrary code via crafted stored data or templates. JobQueue, FileCache, and Session deserialize data without class restrictions or integrity checks; InstallCommand leaves git-clone arguments unescaped, and cleanDangerousTwig omits callable helpers from its blocklist. Exploitation requires control of serialized storage or Twig content, or admin access for installation; FileCache is not the default cache adapter.

The record

CVE
CVE-2026-56700
Published
Jun 30, 2026
Updated
Oct 8, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-78, CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grav · Gravversion=0 <2.0.0-beta.2

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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