{"id":"GHSA-3f29-pqwf-v4j4","summary":"Grav Vulnerable to Sensitive Information Disclosure via Accounts Service Bypass","details":"## Summary\nInformation disclosure exists in `Grav CMS v1.8.0-beta.29`. Despite previous security patches (notably in `v1.8.0-beta.27/28`) aimed at restricting sensitive object access within the Twig environment, the Accounts Service remains exposed.\n\nA low-privileged user (EX: Content Editor with only pages.update permissions) can bypass the existing Twig sandbox restrictions by utilizing the `grav['accounts']` service. Attacker can programmatically load administrative user objects and extract sensitive data, including Bcrypt password hashes and the security salt.\n\n## Affected version\nGrav CMS: `v1.8.0-beta.29` (and earlier 1.8.x beta versions).\n\nNote: This vulnerability persists even after the vendor attempted to mitigate similar SSTI vectors in earlier beta releases.\n\n## Steps to Reproduce\n1. Create a low-privileged account (MY CASE IS 'editor_chen') with permissions limited to admin.login and basic page management (create, update, list). Ensure all administrative permissions (Configuration, User Accounts, ...) are explicitly Denied.\n\n2. Login to the Admin panel using  `editor_chen`. Navigate to Pages and edit the `Home` page.\n\n\n3. Under the Advanced tab, ensure Process Twig is enabled .\n\n4. In the Content tab, inject the following Twig payload designed to bypass the `isDangerousFunction` filter by accessing the internal service container:\n```\n---\ntitle: Information Disclosure Test\nprocess:\n    twig: true\n---\n# Security Audit Results\n- Admin Password Hash: {{ grav['accounts'].load('admin').get('hashed_password') }}\n- Security Salt: {{ grav.config.get('security.salt') }}\n```\n\u003cimg width=\"1176\" height=\"618\" alt=\"GRAV\" src=\"https://github.com/user-attachments/assets/7970216a-2dc6-4d1b-8dfd-b64f3712c9c5\" /\u003e\n\n\n5. Click Save. And navigate to the public page (`http://localhost:8000/home`). Page will render and display the administrator's Bcrypt hash and the system security salt.\n\u003cimg width=\"1278\" height=\"462\" alt=\"GRAV2\" src=\"https://github.com/user-attachments/assets/33b7b894-6ae3-4d29-bd2d-8004e9b343e0\" /\u003e\n\n\n\n\n\n\n\n## PoC\n```\n---\ntitle: Information Disclosure Test\nprocess:\n    twig: true\n---\n# Security Audit Results\n- Admin Password Hash: {{ grav['accounts'].load('admin').get('hashed_password') }}\n- Security Salt: {{ grav.config.get('security.salt') }}\n```\n\n## Impact\nAttackers can obtain the password hashes of all registered users, including Super Administrators.\n\nExtracted hashes can be subjected to offline brute-force or dictionary attacks (EX: USE Hashcat)\n\n## Video\nPls refer to the attached video\n\u003cvideo src=\"https://github.com/user-attachments/assets/74d5ae41-7911-4099-b2cc-e6c51b27c68c\" controls=\"controls\" style=\"max-width: 100%;\"\u003e\n\u003c/video\u003e\n\n\n\n---\n\n## Maintainer note — fix applied (2026-04-24)\n\nFixed in Grav core on the `2.0` branch: commit [`d904efc33`](https://github.com/getgrav/grav/commit/d904efc33) — will ship in **2.0.0-beta.2**.\n\n**What changed:** the HMAC key formerly stored as `security.salt` in `user/config/security.yaml` has moved **out of the Config tree** into `user/config/security-private.php`. On upgrade, the existing salt value is migrated into the new file on first request (preserving CSRF nonces and sessions) and the key is scrubbed from both the live `Config` object and the on-disk YAML — so `{{ grav.config.get('security.salt') }}` from a sandboxed Twig template now returns null. The `.php` extension is blocked from web access by the default `user/*.php` htaccess rule; the file contains only a `return` statement, so direct PHP exec produces no output either.\n\nThe PoC's password-hash half (`grav['accounts'].load('admin').get('hashed_password')`) was already covered by the new Twig content sandbox in 2.0.0-beta.2 — `UserCollection::load` is not in the sandbox allowlist — see the separate GHSA-58hj-46fw-rcfm advisory.\n\n**Files:**\n- [`system/src/Grav/Common/Security.php`](https://github.com/getgrav/grav/blob/2.0/system/src/Grav/Common/Security.php) — new `Security::getNonceKey()` + migration.\n- [`system/src/Grav/Common/Utils.php`](https://github.com/getgrav/grav/blob/2.0/system/src/Grav/Common/Utils.php) — `generateNonceString` now uses the new key.\n- [`system/src/Grav/Common/Service/SessionServiceProvider.php`](https://github.com/getgrav/grav/blob/2.0/system/src/Grav/Common/Service/SessionServiceProvider.php).\n- [`system/src/Grav/Common/Config/Setup.php`](https://github.com/getgrav/grav/blob/2.0/system/src/Grav/Common/Config/Setup.php) — removed auto-gen of `security.salt`.\n- [`system/config/security.yaml`](https://github.com/getgrav/grav/blob/2.0/system/config/security.yaml) — removed placeholder `salt:`.\n- [`tests/unit/Grav/Common/Security/NonceKeySecurityTest.php`](https://github.com/getgrav/grav/blob/2.0/tests/unit/Grav/Common/Security/NonceKeySecurityTest.php) — migration + generation coverage.","aliases":["CVE-2026-42610"],"modified":"2026-09-10T03:51:04.417846827Z","published":"2026-05-05T21:26:45Z","database_specific":{"github_reviewed_at":"2026-05-05T21:26:45Z","nvd_published_at":"2026-05-11T16:17:33Z","cwe_ids":["CWE-863"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/getgrav/grav/security/advisories/GHSA-3f29-pqwf-v4j4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42610"},{"type":"WEB","url":"https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47"},{"type":"PACKAGE","url":"https://github.com/getgrav/grav"}],"affected":[{"package":{"name":"getgrav/grav","ecosystem":"Packagist","purl":"pkg:composer/getgrav/grav"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0-beta.2"}]}],"versions":["0.8.0","0.9.0","0.9.1","0.9.10","0.9.11","0.9.12","0.9.13","0.9.14","0.9.15","0.9.16","0.9.17","0.9.18","0.9.19","0.9.2","0.9.20","0.9.21","0.9.22","0.9.23","0.9.24","0.9.25","0.9.26","0.9.27","0.9.28","0.9.29","0.9.3","0.9.30","0.9.31","0.9.32","0.9.33","0.9.34","0.9.35","0.9.36","0.9.37","0.9.38","0.9.39","0.9.4","0.9.40","0.9.41","0.9.42","0.9.43","0.9.44","0.9.45","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","1.0.0","1.0.0-rc.1","1.0.0-rc.2","1.0.0-rc.3","1.0.0-rc.4","1.0.0-rc.5","1.0.0-rc.6","1.0.1","1.0.10","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.0-beta.1","1.1.0-beta.2","1.1.0-beta.3","1.1.0-beta.4","1.1.0-beta.5","1.1.0-rc.1","1.1.0-rc.2","1.1.0-rc.3","1.1.1","1.1.10","1.1.11","1.1.12","1.1.13","1.1.14","1.1.15","1.1.16","1.1.17","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.9","1.1.9-rc.1","1.1.9-rc.2","1.1.9-rc.3","1.2.0","1.2.0-rc.1","1.2.0-rc.2","1.2.0-rc.3","1.2.1","1.2.2","1.2.3","1.2.4","1.3.0","1.3.0-rc.1","1.3.0-rc.2","1.3.0-rc.3","1.3.0-rc.4","1.3.0-rc.5","1.3.1","1.3.10","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.0-beta.1","1.4.0-beta.2","1.4.0-beta.3","1.4.0-rc.1","1.4.0-rc.2","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.5.0","1.5.0-beta.1","1.5.0-beta.2","1.5.0-rc.1","1.5.1","1.5.10","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.5.9","1.6.0","1.6.0-beta.1","1.6.0-beta.2","1.6.0-beta.3","1.6.0-beta.4","1.6.0-beta.5","1.6.0-beta.6","1.6.0-beta.7","1.6.0-beta.8","1.6.0-rc.1","1.6.0-rc.2","1.6.0-rc.3","1.6.0-rc.4","1.6.1","1.6.10","1.6.11","1.6.12","1.6.13","1.6.14","1.6.15","1.6.16","1.6.17","1.6.18","1.6.19","1.6.2","1.6.20","1.6.21","1.6.22","1.6.23","1.6.24","1.6.25","1.6.26","1.6.27","1.6.28","1.6.29","1.6.3","1.6.30","1.6.31","1.6.4","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","1.7.0","1.7.0-beta.1","1.7.0-beta.10","1.7.0-beta.2","1.7.0-beta.3","1.7.0-beta.4","1.7.0-beta.5","1.7.0-beta.6","1.7.0-beta.7","1.7.0-beta.8","1.7.0-beta.9","1.7.0-rc.1","1.7.0-rc.10","1.7.0-rc.11","1.7.0-rc.12","1.7.0-rc.13","1.7.0-rc.14","1.7.0-rc.15","1.7.0-rc.16","1.7.0-rc.17","1.7.0-rc.18","1.7.0-rc.19","1.7.0-rc.2","1.7.0-rc.20","1.7.0-rc.3","1.7.0-rc.4","1.7.0-rc.5","1.7.0-rc.6","1.7.0-rc.7","1.7.0-rc.8","1.7.0-rc.9","1.7.1","1.7.10","1.7.12","1.7.13","1.7.14","1.7.15","1.7.16","1.7.17","1.7.18","1.7.19","1.7.20","1.7.21","1.7.22","1.7.23","1.7.24","1.7.25","1.7.26","1.7.26.1","1.7.27","1.7.27.1","1.7.28","1.7.29","1.7.29.1","1.7.3","1.7.30","1.7.31","1.7.32","1.7.33","1.7.34","1.7.35","1.7.36","1.7.37","1.7.37.1","1.7.38","1.7.39","1.7.39.1","1.7.39.2","1.7.39.3","1.7.39.4","1.7.4","1.7.40","1.7.41","1.7.41.1","1.7.41.2","1.7.42","1.7.42.1","1.7.42.2","1.7.42.3","1.7.43","1.7.44","1.7.45","1.7.46","1.7.47","1.7.48","1.7.49","1.7.49.1","1.7.49.2","1.7.49.3","1.7.49.4","1.7.49.5","1.7.5","1.7.51","1.7.52","1.7.53","1.7.53.1","1.7.53.2","1.7.53.3","1.7.6","1.7.7","1.7.8","1.7.9","1.8.0-beta.1","1.8.0-beta.10","1.8.0-beta.11","1.8.0-beta.12","1.8.0-beta.13","1.8.0-beta.14","1.8.0-beta.15","1.8.0-beta.16","1.8.0-beta.17","1.8.0-beta.18","1.8.0-beta.19","1.8.0-beta.2","1.8.0-beta.20","1.8.0-beta.21","1.8.0-beta.22","1.8.0-beta.23","1.8.0-beta.24","1.8.0-beta.25","1.8.0-beta.26","1.8.0-beta.27","1.8.0-beta.28","1.8.0-beta.29","1.8.0-beta.3","1.8.0-beta.4","1.8.0-beta.5","1.8.0-beta.6","1.8.0-beta.7","1.8.0-beta.8","1.8.0-beta.9","2.0.0-beta.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-3f29-pqwf-v4j4/GHSA-3f29-pqwf-v4j4.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}