{"uuid": "757eab8f-fbca-4258-928f-88d48c9347c5", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-75837", "type": "seen", "source": "https://gist.github.com/alon710/70fc2f1f262a7b3002a77491b67fce87", "content": "# CVE-2026-75837: CVE-2026-75837: Privilege Escalation in Grav CMS via Missing Blueprint Validation\n\n> **CVSS Score:** 9.1\n> **Published:** 2026-09-17\n> **Full Report:** https://cvereports.com/reports/CVE-2026-75837\n\n## Summary\nCVE-2026-75837 is a critical privilege escalation vulnerability affecting the Grav Flat-File Content Management System (CMS) in versions prior to 2.0.14. Due to a missing security guard on the access field within the core Flex group blueprint configuration file (system/blueprints/user/group.yaml), a delegated administrative operator can submit a crafted payload to elevate their permissions to super-administrator, which can then be leveraged to achieve remote code execution.\n\n## TL;DR\nA missing security decorator in Grav's group blueprint allowed delegated admin users to assign themselves super-admin privileges, leading to potential remote code execution.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-269\n- **Attack Vector**: Network\n- **CVSS v3.1**: 9.1 (Critical)\n- **EPSS Score**: 0.00339 (Percentile: 27.20%)\n- **Exploit Status**: PoC\n- **KEV Status**: Not Listed\n\n## Affected Systems\n\n- Grav CMS\n- **grav**: < 2.0.14 (Fixed in: `2.0.14`)\n\n## Mitigation\n\n- Upgrade Grav CMS to version 2.0.14 or above\n- Apply manual hotfix to system/blueprints/user/group.yaml if immediate upgrade is not feasible\n- Implement regular audits of user group configuration files for unauthorized permissions\n\n**Remediation Steps:**\n1. Locate system/blueprints/user/group.yaml inside your Grav installation directory.\n2. Find the 'access:' field parameter.\n3. Add 'security@: admin.super' under the access configuration parameters.\n4. Save the file and clear the Grav cache by executing 'bin/grav clear-cache'.\n\n## References\n\n- [GitHub Security Advisory](https://github.com/getgrav/grav/security/advisories/GHSA-xhfv-7758-r9hx)\n- [National Vulnerability Database (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2026-75837)\n- [Vulnerability & Exploit Research Release](https://www.vulncheck.com/advisories/grav-before-privilege-escalation-via-group-access-field)\n- [Git Commit Patch Diff](https://github.com/getgrav/grav/commit/5192316f5bf0f033636f43561829d7fc13a4ab64)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-75837) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-09-17T22:32:09.073841Z"}