Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms
The advisory, in context
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))}}
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 packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Earlier releases before 1.8.0-beta.27
Fixed in 1.8.0-beta.27
317 explicitly affected versions
0.8.0, 0.9.0, 0.9.1, 0.9.10, 0.9.11, 0.9.12, 0.9.13, 0.9.14, 0.9.15, 0.9.16, 0.9.17, 0.9.18, 0.9.19, 0.9.2, 0.9.20, 0.9.21, 0.9.22, 0.9.23, 0.9.24, 0.9.25, 0.9.26, 0.9.27, 0.9.28, 0.9.29, 0.9.3, 0.9.30, 0.9.31, 0.9.32, 0.9.33, 0.9.34, 0.9.35, 0.9.36, 0.9.37, 0.9.38, 0.9.39, 0.9.4, 0.9.40, 0.9.41, 0.9.42, 0.9.43, 0.9.44, 0.9.45, 0.9.5, 0.9.6, 0.9.7, 0.9.8, 0.9.9, 1.0.0, 1.0.0-rc.1, 1.0.0-rc.2, 1.0.0-rc.3, 1.0.0-rc.4, 1.0.0-rc.5, 1.0.0-rc.6, 1.0.1, 1.0.10, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.1.0, 1.1.0-beta.1, 1.1.0-beta.2, 1.1.0-beta.3, 1.1.0-beta.4, 1.1.0-beta.5, 1.1.0-rc.1, 1.1.0-rc.2, 1.1.0-rc.3, 1.1.1, 1.1.10, 1.1.11, 1.1.12, 1.1.13, 1.1.14, 1.1.15, 1.1.16, 1.1.17, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.1.7, 1.1.8, 1.1.9, 1.1.9-rc.1, 1.1.9-rc.2, 1.1.9-rc.3, 1.2.0, 1.2.0-rc.1, 1.2.0-rc.2, 1.2.0-rc.3, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.3.0, 1.3.0-rc.1, 1.3.0-rc.2, 1.3.0-rc.3, 1.3.0-rc.4, 1.3.0-rc.5, 1.3.1, 1.3.10, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.3.8, 1.3.9, 1.4.0, 1.4.0-beta.1, 1.4.0-beta.2, 1.4.0-beta.3, 1.4.0-rc.1, 1.4.0-rc.2, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.4.7, 1.4.8, 1.5.0, 1.5.0-beta.1, 1.5.0-beta.2, 1.5.0-rc.1, 1.5.1, 1.5.10, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 1.5.7, 1.5.8, 1.5.9, 1.6.0, 1.6.0-beta.1, 1.6.0-beta.2, 1.6.0-beta.3, 1.6.0-beta.4, 1.6.0-beta.5, 1.6.0-beta.6, 1.6.0-beta.7, 1.6.0-beta.8, 1.6.0-rc.1, 1.6.0-rc.2, 1.6.0-rc.3, 1.6.0-rc.4, 1.6.1, 1.6.10, 1.6.11, 1.6.12, 1.6.13, 1.6.14, 1.6.15, 1.6.16, 1.6.17, 1.6.18, 1.6.19, 1.6.2, 1.6.20, 1.6.21, 1.6.22, 1.6.23, 1.6.24, 1.6.25, 1.6.26, 1.6.27, 1.6.28, 1.6.29, 1.6.3, 1.6.30, 1.6.31, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.8, 1.6.9, 1.7.0, 1.7.0-beta.1, 1.7.0-beta.10, 1.7.0-beta.2, 1.7.0-beta.3, 1.7.0-beta.4, 1.7.0-beta.5, 1.7.0-beta.6, 1.7.0-beta.7, 1.7.0-beta.8, 1.7.0-beta.9, 1.7.0-rc.1, 1.7.0-rc.10, 1.7.0-rc.11, 1.7.0-rc.12, 1.7.0-rc.13, 1.7.0-rc.14, 1.7.0-rc.15, 1.7.0-rc.16, 1.7.0-rc.17, 1.7.0-rc.18, 1.7.0-rc.19, 1.7.0-rc.2, 1.7.0-rc.20, 1.7.0-rc.3, 1.7.0-rc.4, 1.7.0-rc.5, 1.7.0-rc.6, 1.7.0-rc.7, 1.7.0-rc.8, 1.7.0-rc.9, 1.7.1, 1.7.10, 1.7.12, 1.7.13, 1.7.14, 1.7.15, 1.7.16, 1.7.17, 1.7.18, 1.7.19, 1.7.20, 1.7.21, 1.7.22, 1.7.23, 1.7.24, 1.7.25, 1.7.26, 1.7.26.1, 1.7.27, 1.7.27.1, 1.7.28, 1.7.29, 1.7.29.1, 1.7.3, 1.7.30, 1.7.31, 1.7.32, 1.7.33, 1.7.34, 1.7.35, 1.7.36, 1.7.37, 1.7.37.1, 1.7.38, 1.7.39, 1.7.39.1, 1.7.39.2, 1.7.39.3, 1.7.39.4, 1.7.4, 1.7.40, 1.7.41, 1.7.41.1, 1.7.41.2, 1.7.42, 1.7.42.1, 1.7.42.2, 1.7.42.3, 1.7.43, 1.7.44, 1.7.45, 1.7.46, 1.7.47, 1.7.48, 1.7.49, 1.7.49.1, 1.7.49.2, 1.7.49.3, 1.7.49.4, 1.7.49.5, 1.7.5, 1.7.51, 1.7.52, 1.7.53, 1.7.53.1, 1.7.53.2, 1.7.53.3, 1.7.6, 1.7.7, 1.7.8, 1.7.9, 1.8.0-beta.1, 1.8.0-beta.10, 1.8.0-beta.11, 1.8.0-beta.12, 1.8.0-beta.13, 1.8.0-beta.14, 1.8.0-beta.15, 1.8.0-beta.16, 1.8.0-beta.17, 1.8.0-beta.18, 1.8.0-beta.19, 1.8.0-beta.2, 1.8.0-beta.20, 1.8.0-beta.21, 1.8.0-beta.22, 1.8.0-beta.23, 1.8.0-beta.24, 1.8.0-beta.25, 1.8.0-beta.26, 1.8.0-beta.3, 1.8.0-beta.4, 1.8.0-beta.5, 1.8.0-beta.6, 1.8.0-beta.7, 1.8.0-beta.8, 1.8.0-beta.9
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.0-beta.27"
}
],
"type": "ECOSYSTEM"
}
],
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}