GHSA-mc5q-6hpj-rp7j

Source

https://github.com/advisories/GHSA-mc5q-6hpj-rp7j

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-mc5q-6hpj-rp7j/GHSA-mc5q-6hpj-rp7j.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-mc5q-6hpj-rp7j

Aliases

Published

2026-09-02T21:41:12Z

Modified

2026-09-02T21:45:10Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

Grav: Twig sandbox config exfiltration via grav.offsetGet + dump filter (CVE-2026-44738 bypass)

Details

Summary

The Twig content sandbox replaces config with the redacted SandboxConfig facade and strips Config::get/toArray from the method allowlist (GHSA-j274-39qw-32c9), so editor content can't read config secrets via config. That's bypassable: grav is the raw container, offsetget is allow-listed on it, so grav.offsetGet('config') returns the real Config. The allow-listed filters json_encode/print_r/yaml_encode then serialize it at the PHP level, never hitting the sandbox method gate, dumping the whole config tree including every plugins.* secret (SMTP creds, API keys, plugin DB creds). Incomplete fix for GHSA-j274-39qw-32c9. security.salt does not leak (it lives outside config).

Details

The documented path is blocked: config is the SandboxConfig facade (Twig.php:660) and the raw Config/Data method entries are stripped when config_access is false, so {{ config.get(...) }} returns the default and {{ grav.offsetGet('config').get(...) }} raises SecurityNotAllowedMethodError.

The bypass uses two allow-listed primitives the redaction doesn't cover:

grav.offsetGet('config') returns the raw Config. The SandboxConfig facade replaces only the config variable, not grav['config']; offsetget is allow-listed on Grav\Common\Grav in system/config/security.yaml.
json_encode/print_r/yaml_encode serialize the object inside the filter and never call GravSecurityPolicy::checkMethodAllowed (GravSecurityPolicy.php:65), so the stripped methods don't matter.

Bug class: object-dumping filters bypass the sandbox member gate. The same dump reaches page/pages/uri/user via their allow-listed accessors; config is the secret-bearing target.

Reachable below the publisher-Twig opt-in: a _-prefixed slug is modular (Page.php:228), and Page::content() sets $process_twig = $scan_twig_xss || $this->modularTwig() (Page.php:816), so a modular child's body Twig is sandboxed-rendered even with twig_content.process_enabled false (the default), while $scan_twig_xss stays false so the render-time XSS scan (GHSA-2c4f-86xc-cr74) is skipped. Any admin.pages author (or filesystem write to user/pages) exfiltrates config on a stock install. On a regular process.twig page the whole-tree dump trips the XSS scan and is blanked, but a targeted split/slice extraction of one subtree is XSS-clean and survives.

PoC

Sandboxed render, config_access default false. First two lines show the gate holding, third is the bypass:

{{ config.get('plugins.email.mailer.smtp.password', 'DENIED') }}
{# => DENIED #}
{{ grav.offsetGet('config').get('plugins.email.mailer.smtp.password') }}
{# => SecurityNotAllowedMethodError 'get' #}
{{ grav.offsetGet('config')|json_encode }}
{# => {...,"plugins":{"email":{"mailer":{"smtp":{"password":"CANARY..."}}}},...} #}

Stock-install reproduction (no user/config/security.yaml):

# user/config/plugins/email.yaml  -- decoy secret
mailer: { smtp: { password: CANARY_SMTP_PW_8b3f1 } }

# user/pages/70.parent/default.md
---
title: Parent
content: { items: '@self.modular' }
template: modular
---

{# user/pages/70.parent/_secret/default.md #}
---
title: Secret
template: modular/text
---
{{ grav.offsetGet('config')|json_encode }}

curl -s http://localhost/parent   # body contains CANARY_SMTP_PW_8b3f1

logs/security.log shows no sandbox block and no XSS scan for the route. Verified on Grav 2.0.1 (6f619f0ae), PHP 8.4.22, Twig 3.26.1-DEV.

Impact

A page author (admin.pages, no admin/super) reads the entire config tree: plugin SMTP credentials, API keys, plugin DB credentials. Read-only. Default install; the modular path needs no Twig opt-in.

Fix

system/config/security.yaml: drop offsetget (and __get) from twig_sandbox.allowed_methods for Grav\Common\Grav -- the legit uses are theme/getversion; offsetget is the raw-container reach. Closes the demonstrated path.

Sandbox-wide: make json_encode/print_r/yaml_encode/string refuse non-allow-listed objects when $env->isSandboxed() (mirror the Closure-only guard Twig applies to map/filter/reduce). Closes the class for page/pages/uri/user too.

Database specific

{
    "cwe_ids":  [
        "CWE-200"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-02T21:41:12Z",
    "nvd_published_at":  "2026-08-19T16:18:17Z",
    "severity":  "MODERATE"
}

References

Affected packages

Packagist / getgrav/grav

Package

Name: getgrav/grav
Purl: pkg:composer/getgrav/grav

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.0.2

Affected versions

0.*

0.8.0

0.9.0

0.9.1

0.9.2

0.9.3

0.9.4

0.9.5

0.9.6

0.9.7

0.9.8

0.9.9

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

0.9.20

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

0.9.30

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

0.9.40

0.9.41

0.9.42

0.9.43

0.9.44

0.9.45

1.*

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

1.0.0

1.0.1

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

1.0.10

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

1.1.0

1.1.1

1.1.2

1.1.3

1.1.4

1.1.5

1.1.6

1.1.7

1.1.8

1.1.9-rc.1

1.1.9-rc.2

1.1.9-rc.3

1.1.9

1.1.10

1.1.11

1.1.12

1.1.13

1.1.14

1.1.15

1.1.16

1.1.17

1.2.0-rc.1

1.2.0-rc.2

1.2.0-rc.3

1.2.0

1.2.1

1.2.2

1.2.3

1.2.4

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

1.3.0

1.3.1

1.3.2

1.3.3

1.3.4

1.3.5

1.3.6

1.3.7

1.3.8

1.3.9

1.3.10

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

1.4.0

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-beta.1

1.5.0-beta.2

1.5.0-rc.1

1.5.0

1.5.1

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9

1.5.10

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

1.6.0

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.6.6

1.6.7

1.6.8

1.6.9

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

1.6.20

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

1.6.30

1.6.31

1.7.0-beta.1

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-beta.10

1.7.0-rc.1

1.7.0-rc.2

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

1.7.0-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.20

1.7.0

1.7.1

1.7.3

1.7.4

1.7.5

1.7.6

1.7.7

1.7.8

1.7.9

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

1.7.30

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

1.7.40

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

1.7.51

1.7.52

1.7.53

1.7.53.1

1.7.53.2

1.7.53.3

1.8.0-beta.1

1.8.0-beta.2

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

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.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.27

1.8.0-beta.28

1.8.0-beta.29

2.*

2.0.0-beta.1

2.0.0-beta.2

2.0.0-beta.3

2.0.0-beta.4

2.0.0-rc.1

2.0.0-rc.2

2.0.0-rc.3

2.0.0-rc.4

2.0.0-rc.5

2.0.0-rc.6

2.0.0-rc.7

2.0.0-rc.8

2.0.0-rc.9

2.0.0-rc.10

2.0.0

2.0.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-mc5q-6hpj-rp7j/GHSA-mc5q-6hpj-rp7j.json"