Description
Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| getgrav | grav | < 2.0.15 | 2.0.15 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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abraxas/CVE-2026-75827 ★ 0 · Sep 18, 2026
CVE-2026-75827 - getgrav - High 8.8 - Unauthenticated GET /poc-form - Arbitrary File Write
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | getgrav/grav | < 2.0.15 | 2.0.15 | GHSA-f8wv-xp27-6gq7 |
References
- GitHub Security Advisory (GHSA-f8wv-xp27-6gq7) vendor-advisory
- VulnCheck Advisory: Grav before 2.0.15 Arbitrary File Write via error_log third-party-advisory