CVE-2026-75827
Grav before 2.0.15 Arbitrary File Write via error_log
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 18, 2026
- Updated
- Oct 8, 2026
- Reserved
- Aug 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-94 Improper Control of Generation of Code ('Code Injection')
Affected Products
| Product | Versions |
|---|---|
gravgetgrav |
|
References
- GitHub Security Advisory (GHSA-f8wv-xp27-6gq7)vendor-advisory
- VulnCheck Advisory: Grav before 2.0.15 Arbitrary File Write via error_logthird-party-advisory
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