RCE in Getgrav Grav
CVE-2026-75827
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.009 · change: +0.003
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7 (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75827?
- CVE-2026-75827 is a high-severity vulnerability in Getgrav Grav, classified under Code Injection. CVSS score: 8.8/10. Published 2026-08-18.
- How severe is CVE-2026-75827?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-75827 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.