{"id":"CVE-2026-33479","aliases":["GHSA-xggw-g9pm-9qhh"],"url":"https://o3.security/vulnerability/CVE-2026-33479","summary":"AVideo has PHP Code Injection via eval() in Gallery saveSort.json.php Exploitable Through CSRF Against Admin","details":"## Summary\n\nThe Gallery plugin's `saveSort.json.php` endpoint passes unsanitized user input from `$_REQUEST['sections']` array values directly into PHP's `eval()` function. While the endpoint is gated behind `User::isAdmin()`, it has no CSRF token validation. Combined with AVideo's explicit `SameSite=None` session cookie configuration, an attacker can exploit this via cross-site request forgery to achieve unauthenticated remote code execution — requiring only that an admin visits an attacker-controlled page.\n\n## Details\n\n**Vulnerable code** — `plugin/Gallery/view/saveSort.json.php:20-25`:\n\n```php\nif(!empty($_REQUEST['sections'])){\n $object = $gallery->getDataObject();\n foreach ($_REQUEST['sections'] as $key => $value) {\n $obj->sectionsSaved[] = array($key=>$value);\n eval(\"\\$object->{$value}Order = \\$key;\");\n }\n $obj->error = !$gallery->setDataObject($object);\n}\n```\n\nThe `$value` variable from `$_REQUEST['sections']` is interpolated directly into the string passed to `eval()` with no sanitization — no allowlist, no regex validation, no escaping. Normal Gallery usage sends section names like `'Shorts'`, `'Trending'`, etc. from jQuery UI sortable, but the server enforces no such constraint.\n\n**CSRF enablement** — `objects/include_config.php:134-137`:\n\n```php\nif ($isHTTPS) {\n ini_set('session.cookie_samesite', 'None');\n ini_set('session.cookie_secure', '1');\n}\n```\n\nThe session cookie is explicitly set to `SameSite=None`, which instructs browsers to send the cookie on cross-site requests. This is also reinforced in `objects/functionsPHP.php:330-333` where additional cookies are set with `SameSite=None; Secure`.\n\n**No CSRF protection** — The endpoint performs no CSRF token validation, no Origin header check, no Referer header check, and no `X-Requested-With` header check. There is no global CSRF middleware in AVideo's bootstrap chain.\n\n**Exploit chain:**\n1. Attacker crafts a page with an auto-submitting form targeting `saveSort.json.php`\n2. Admin visits the attacker's page (e.g., via a link in a comment, email, or message)\n3. The browser sends the cross-site POST request **with the admin's session cookie** attached (due to `SameSite=None`)\n4. `User::isAdmin()` passes because the admin's session is present\n5. The injected PHP code in the `sections` array value is passed to `eval()` and executes\n\n## PoC\n\n**Step 1:** Host the following HTML on an attacker-controlled server:\n\n```html\n\n\n\n
\n \n
\n\n\n\n```\n\nThe base64 decodes to `id;hostname`.\n\n**Step 2:** Lure an authenticated AVideo admin to visit the page.\n\n**Step 3:** The eval on line 24 executes:\n```php\n$object->x=1;system(base64_decode('aWQ7aG9zdG5hbWU='));//Order = 0;\n```\n\nThis breaks out of the property assignment, calls `system()` with attacker-controlled arguments, and comments out the rest of the line. The response JSON will contain the command output, but even without seeing the response, the command executes server-side.\n\n**Expected result:** The `id` and `hostname` commands execute on the server under the web server's user context.\n\n## Impact\n\n- **Remote Code Execution** — An attacker achieves arbitrary PHP code execution on the server by luring an admin to visit a malicious page. No prior authentication or account on the target is required.\n- **Full server compromise** — The attacker can read/write files, access the database, pivot to other services, install backdoors, or exfiltrate data.\n- **Stealth** — The attack is a single form submission that completes in milliseconds. The admin may not notice anything unusual.\n- **Blast radius** — Any AVideo instance running over HTTPS (which triggers `SameSite=None`) where an admin can be lured to click a link is vulnerable.\n\n## Recommended Fix\n\n**Primary fix — Replace `eval()` with an allowlist check:**\n\nIn `plugin/Gallery/view/saveSort.json.php`, replace lines 20-26:\n\n```php\nif(!empty($_REQUEST['sections'])){\n $object = $gallery->getDataObject();\n $allowedSections = ['Shorts', 'Trending', 'SiteSuggestion', 'Newest', \n 'Subscribe', 'Popular', 'LiveStream', 'Category', \n 'Program', 'Channel'];\n foreach ($_REQUEST['sections'] as $key => $value) {\n if (!in_array($value, $allowedSections, true)) {\n continue;\n }\n $obj->sectionsSaved[] = array($key => $value);\n $property = $value . 'Order';\n $object->$property = intval($key);\n }\n $obj->error = !$gallery->setDataObject($object);\n}\n```\n\nThis eliminates `eval()` entirely, validates `$value` against a known allowlist of section names, and uses dynamic property access (`$object->$property`) instead of code generation.\n\n**Secondary fix — Add CSRF protection** to all state-changing endpoints, or at minimum set `SameSite=Lax` on session cookies instead of `SameSite=None` in `objects/include_config.php:135`:\n\n```php\nini_set('session.cookie_samesite', 'Lax');\n```\n\nThis prevents session cookies from being sent on cross-site form submissions, blocking the CSRF vector for all endpoints.","published":"2026-03-23T14:05:55.725Z","modified":"2026-08-12T03:51:35.292244525Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00531,"percentile":0.42897,"asOf":"2026-09-03"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"wwbn/avideo","fixedVersion":null}],"fix":{"url":"https://github.com/WWBN/AVideo/commit/087dab8841f8bdb54be184105ef19b47c5698fcb","label":"WWBN/AVideo@087dab8"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33479.json"},{"type":"ADVISORY","url":"https://github.com/WWBN/AVideo/security/advisories/GHSA-xggw-g9pm-9qhh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33479"},{"type":"FIX","url":"https://github.com/WWBN/AVideo/commit/087dab8841f8bdb54be184105ef19b47c5698fcb"},{"type":"PACKAGE","url":"https://github.com/WWBN/AVideo"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:35.292244525Z"}}