Critical severity9.1GHSA Advisory· Published May 11, 2026· Updated Jun 17, 2026
CVE-2026-42608
CVE-2026-42608
Description
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component. By manipulating the session_id (passed as __form-flash-id in POST requests), an unauthenticated attacker can traverse the filesystem to create arbitrary directories and write an index.yaml file containing attacker-controlled data. This vulnerability can lead to unauthorized modification of application behavior, potential data integrity issues, and service disruption in production environments. This vulnerability is fixed in 2.0.0-beta.2.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
getgrav/gravPackagist | < 2.0.0-beta.2 | 2.0.0-beta.2 |
Affected products
4Patches
Vulnerability mechanics
References
5- github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-hmcx-ch82-3fv2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42608ghsaADVISORY
- github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47ghsaWEB
- github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632ghsaWEB
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