{"id":"CVE-2026-75827","title":"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","summary":"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 acces…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-94"],"vendor":"getgrav","product":"grav","affected":["grav < 2.0.15"],"patched":["getgrav/grav 2.0.15"],"published":"2026-08-18","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:40.627","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75827","references":[{"url":"https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log","label":"disclosure@vulncheck.com"},{"url":"https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75827"},{"url":"https://github.com/advisories/GHSA-f8wv-xp27-6gq7"}],"tags":["nvd","cve.org","exploit-available","ghsa","composer"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-19T14:12:08.072366Z"},"epss":0.00859,"epssPercentile":0.5827,"exploits":{"github":1,"githubRepos":["https://github.com/abraxas/CVE-2026-75827"],"checkedAt":"2026-10-27T19:12:14.602Z"},"aliases":["GHSA-f8wv-xp27-6gq7"],"ecosystem":"composer","ingestedAt":"2026-09-08T21:11:12.279Z","slug":"CVE-2026-75827","body":"## Overview\n\nGrav 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-75827)\n\nAffected packages:\n\n- `getgrav/grav <= 2.0.14`\n\nPatched in:\n\n- `getgrav/grav 2.0.15`\n\nSource: https://github.com/advisories/GHSA-f8wv-xp27-6gq7","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[{"seq":207757,"id":"CVE-2026-75827","ts":1789838093495,"field":"exploit_available","old":"false","new":"true"}]}