by Kastro
Paper/Archive/CVE-2026-75827

CVE-2026-75827

getgrav grav — Grav before 2.0.15 Arbitrary File Write via error_log

EPSS 0.9%public exploitCVSS 9.3
critical.is priorityof 100
50
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 58.4.584 × 2011.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
grav< 2.0.152.0.15CNA

Scores by source

VulnCheck (CNA)9.3CVSS: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 (CNA)8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7writeupvulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log