GHSA-8535-hvm8-2hmv CVE-2025-66298
Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms
- Severity
- 0.0 / 10
- High · CVSS 4.0
- Exploit chance (EPSS)
- 0.40%
- Chance of exploitation in the next 30 days. Higher than 34.80% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
- Fix
1.8.0-beta.27- Upgrade getgrav/grav to this version or later
Description
Summary
Having a simple form on site can reveal the whole Grav configuration details (including plugin configuration details) by using the correct POST payload. Sensitive information may be contained in the configuration details.
PoC
Create a simple form with two fields, 'registration-number' and 'hp'. Add a submit button and set the method to POST(screenshot attached below). Form name set to 'hero-form'. Send a POST request with the following payload and you will notice a response with a php array listing the whole Grav configuration details - including plugins(screenshot attached).
registration-number:d643aaaa
hp:vJyifp
form-name:hero-form
unique_form_id:{{var_dump(_context|slice(0,7))}}
Screenshot 2025-03-25 at 7 26 02 AM
Screenshot 2025-03-25 at 7 22 58 AM
Impact
Server-Side Template (SST) vulnerability. The vulnerability affects the latest Grav version as of 25th of Match 2025 (1.7.48) with all plugins installed (including forms plugin v.7.4.2) to their latest versions as well.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| getgrav/grav | < 1.8.0-beta.27 |
1.8.0-beta.27 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
getgrav/grav Packagist → 1.8.0-beta.27
- composer
composer require getgrav/grav:^1.8.0-beta.27
Severity breakdown
CVSS 4.0 0.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (vulnerable system)
- High
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- None
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
- Exploit maturity
- Proof of concept
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Weakness
CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.
How to prevent it
- Architecture and Design: Choose a template engine that offers a sandbox or restricted mode, or at least limits the power of any available expressions, function calls, or commands.
- Implementation: Use the template engine's sandbox or restricted mode, if available.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-xjw5-q542-3vmr Grav: config_denied_paths default list omits `system`, exposing real secrets (e.g. system.cache.redis.password) via the Twig sandbox when config_access is enabled | High | Also affects getgrav/grav |
| GHSA-3jhr-mxmx-38cx Grav: UserInterface offsetget/offsetexists allow-listed in Twig sandbox let editor-authored content leak hashed_password and 2FA secrets via offsetGet() | Medium | Also affects getgrav/grav |
| GHSA-9ccq-2jfg-qw33 Grav: Origin validation bypass in Uri::referrer() and Pages::referrerRoute() via unanchored prefix match | Critical | Also affects getgrav/grav |
| GHSA-38p6-h87p-r4cg Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection | Medium | Also affects getgrav/grav |
| GHSA-p597-crqc-m349 Grav: The system, site, and theme Twig variables bypass the content sandbox entirely and are never covered by config_denied_paths | Medium | Also affects getgrav/grav |
| GHSA-47ch-6w46-6xm7 Grav: media_directory() Twig function allows filesystem path traversal and file content disclosure from sandboxed page content | Medium | Also affects getgrav/grav |
| GHSA-jq29-c7v8-rg55 Grav: Path Traversal in MediaUploadTrait::deleteFile() Allows Arbitrary File Deletion | High | Also affects getgrav/grav |
| GHSA-8hgv-xc77-jmcr Grav: Page editors can inject arbitrary script into rendered pages via the Twig sandbox's assets.addJs/addCss allowlist, escalating to super-admin | Medium | Also affects getgrav/grav |
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