{"vulnerability": "ghsa-x76w-8c62-48mg", "sightings": [{"uuid": "d95e1afa-2862-499c-bf95-6c95119e23f6", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "GHSA-x76w-8c62-48mg", "type": "seen", "source": "https://gist.github.com/alon710/b825af035610849f3142d75d4e2989fc", "content": "# GHSA-X76W-8C62-48MG: GHSA-X76W-8C62-48MG: Missing Authorization in Craft CMS AssetsController Leads to Private Asset Disclosure\n\n> **CVSS Score:** 4.3\n> **Published:** 2026-07-06\n> **Full Report:** https://cvereports.com/reports/GHSA-X76W-8C62-48MG\n\n## Summary\nAn improper authorization vulnerability in Craft CMS allows authenticated Control Panel users to bypass volume view permissions and access signed fallback transform preview links for private assets via the assets/preview-thumb action.\n\n## TL;DR\nLow-privileged Control Panel users can retrieve signed preview links for restricted assets due to missing authorization checks in the preview-thumb endpoint.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-862\n- **Attack Vector**: Network (AV:N)\n- **CVSS Score**: 4.3 (Medium)\n- **Impact**: Information Disclosure / Private Asset Access\n- **Exploit Status**: PoC / Theoretical\n- **KEV Status**: Not Listed\n\n## Affected Systems\n\n- Craft CMS\n- **Craft CMS**: >= 4.0.0, < 4.17.8 (Fixed in: `4.17.8`)\n- **Craft CMS**: >= 5.0.0, < 5.9.14 (Fixed in: `5.9.14`)\n\n## Mitigation\n\n- Upgrade Craft CMS to a patched version (4.17.8+ or 5.9.14+).\n- Restrict access to the Craft CMS Control Panel to trusted IP ranges.\n- Implement monitoring for anomalous POST requests to the assets/preview-thumb endpoint.\n\n**Remediation Steps:**\n1. Open a terminal in the Craft CMS root directory.\n2. Execute the command: composer update craftcms/cms\n3. Verify the installed version is 4.17.8 or higher, or 5.9.14 or higher.\n4. Test the preview endpoint with a low-privileged user to confirm an HTTP 403 status is returned for restricted assets.\n\n## References\n\n- [GitHub Security Advisory GHSA-X76W-8C62-48MG](https://github.com/advisories/GHSA-X76W-8C62-48MG)\n- [Craft CMS Security Advisory GHSA-x76w-8c62-48mg](https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg)\n- [Craft CMS Fix Commit](https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/GHSA-X76W-8C62-48MG) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-07-06T20:41:52.810879Z"}]}