# CVE-2026-92917: Grav Twig sandbox configuration disclosure via print_r

Source: https://junglewise.ai/threats/cve-2026-92917-grav-twig-sandbox-configuration-disclosure-via-print-r  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-17. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-92917 · Severity: high · CVSS 7.5 · Published 2026-09-17

Grav is a flat-file content management system used to build and manage websites. Authenticated users with basic page-editing permissions can bypass the security sandbox and expose the entire site configuration—including SMTP credentials, API tokens, and webhook secrets—by embedding a simple print_r command in page content. This allows low-privilege attackers to steal sensitive plugin configuration that operators intended to hide.

Technologies: [Grav](https://junglewise.ai/threats/technologies/grav). Vendors: [Grav](https://junglewise.ai/threats/vendors/grav).

## Quick answers

**Is CVE-2026-92917 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92917 being exploited in the wild.

**How severe is CVE-2026-92917?** High severity, with a CVSS score of 7.5, published 17 September 2026.

**Which products and versions are affected?** Grav 2.0.0-rc.1 through 2.0.21.

**Is there a fix for CVE-2026-92917?** A patch was published on 2026-09-17: Fix released in Grav 2.0.22 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-92917 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-92917?** Check whether you run Grav at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an incomplete fix for CWE-200 (information exposure) in Grav's Twig template sandbox. The GravExtension::assertSandboxDumpSafe() method was added to guard the print_r, vardump, json_encode, yaml_encode, and string filters, but it calls SandboxExtension::isSandboxed() without a Source argument, checking only a global sandbox flag that Grav never enables—causing the guard to never execute. An authenticated user with page-edit rights can render {{ config|print_r }} in page content with Twig processing enabled to dump the full merged configuration, bypassing the SandboxConfig facade's path redaction because print_r directly accesses the real Config object held in a private property. The attack requires authentication and page-edit permissions, but no user interaction. The fix, released in version 2.0.22, registers the affected filters with Twig's needs_is_sandboxed flag to receive the correct per-template sandbox state.

## Affected products

- Grav Grav 2.0.0-rc.1 through 2.0.21

## Timeline

- 2026-09-02: disclosed: GitHub Security Advisory GHSA-rfr9-7h4p-gx2x published
- 2026-09-17: advisory: CVE-2026-92917 published to NVD
- 2026-09-17: patched: Fix released in Grav 2.0.22

## References

- [https://github.com/getgrav/grav/security/advisories/GHSA-rfr9-7h4p-gx2x](https://github.com/getgrav/grav/security/advisories/GHSA-rfr9-7h4p-gx2x)
- [https://www.vulncheck.com/advisories/grav-2.0.0-rc.1-through-2.0.21-configuration-disclosure-via-print-r](https://www.vulncheck.com/advisories/grav-2.0.0-rc.1-through-2.0.21-configuration-disclosure-via-print-r)

## Related threats

- [Grav allowlist bypass in Flex form processing](https://junglewise.ai/threats/cve-2026-116019-grav-2-0-15-before-2-2-13-contains-an-allowlist-bypass)
- [Grav improper access control in FlexDirectory::dynamicFlexField()](https://junglewise.ai/threats/cve-2026-114660-grav-from-2-0-0-before-2-2-5-contains-an-improper-access-control)
- [Grav information disclosure via Twig HTTP Basic credentials](https://junglewise.ai/threats/cve-2026-114657-grav-from-2-0-0-before-2-2-5-contains-an-information-disclosure)
- [Grav image pixel limit bypass allows resource exhaustion](https://junglewise.ai/threats/cve-2026-112782-grav-1-7-53-before-1-7-53-5-and-2-0-0-rc-8-before-2-2-2-contains)
- [Grav information disclosure via nested Git repositories](https://junglewise.ai/threats/cve-2026-109326-grav-before-2-1-7-contains-an-information-disclosure)