CVE-2026-85604Public exploitNetwork attack vector

Authenticated PHP execution via unsandboxed Twig sort callback

Published Sep 4, 2026 · Updated Sep 4, 2026

Code injection in GetGrav Grav 2.0.17 and earlier allows remote authenticated users to execute arbitrary PHP through Twig templates. The GravExtension.php sortFunc wrapper passes false as Twig's sandbox flag, permitting a plain spl_autoload callback that includes attacker-controlled page content. Page-write permission through admin.pages or api.pages.write is sufficient, and execution runs with the web server account's privileges.

CVSS severity8.7
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in GetGrav Grav 2.0.17 and earlier allows remote authenticated users to execute arbitrary PHP through Twig templates. The GravExtension.php sortFunc wrapper passes false as Twig's sandbox flag, permitting a plain spl_autoload callback that includes attacker-controlled page content. Page-write permission through admin.pages or api.pages.write is sufficient, and execution runs with the web server account's privileges.

The record

CVE
CVE-2026-85604
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
GetGrav
Product
Grav
Classifications
CWE-94, T1190, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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 <2.0.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GetGrav · Gravversion=0 <2.0.19

Published CVSS scores

8.7VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
8.8VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:L/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059Command and Scripting Interpreter

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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