CVE-2025-66294Public exploitNetwork attack vector

Command execution via nested Twig sanitizer bypass

Published Dec 1, 2025 · Updated Dec 2, 2025

Server-side template injection in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to execute arbitrary commands. The cleanDangerousTwig method uses a regex that misses nested calls and permits evaluate functions, letting crafted form input reach Twig execution. Editor permission with the Form and Admin plugins is the primary gate; a preexisting form that evaluates guest input also exposes remote attackers.

CVSS severity8.7
High
EPSS probability2.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to execute arbitrary commands. The cleanDangerousTwig method uses a regex that misses nested calls and permits evaluate functions, letting crafted form input reach Twig execution. Editor permission with the Form and Admin plugins is the primary gate; a preexisting form that evaluates guest input also exposes remote attackers.

The record

CVE
CVE-2025-66294
Published
Dec 1, 2025
Updated
Dec 2, 2025
Vendor
GetGrav
Product
Grav
Classifications
CWE-1336, CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.8.0-beta.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GetGrav · Gravversion=< 1.8.0-beta.27

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
CWE-94Improper Control of Generation of Code ('Code Injection')
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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