{"id":"CVE-2026-41663","aliases":["EUVD-2026-28278","GHSA-rw74-vc9h-534j"],"status":"published","title":"Admidio: CSRF on Admin Preferences Triggers Unauthorized Backup, .htaccess Write, and Email Send","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, several administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because SameSite=Lax cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page. This issue has been patched in version 5.0.9.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00117,"percentile":0.01656,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-352"],"published":"2026-04-29T21:54:30Z","modified":"2026-10-28T02:30:39Z","fixes":[{"ecosystem":"Packagist","package":"admidio/admidio","fixed_in":["5.0.9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"admidio/admidio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.0.8"},{"fixed":"5.0.9"}]}]},{"source":"osv","ecosystem":"Packagist","package":"admidio/admidio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.9"}]}],"versions":["4.1.0","4.1.3","v4.2-Beta.1","v4.2-Beta.2","v4.2-Beta.3","v4.2.0","v4.2.1","v4.2.10","v4.2.11","v4.2.12","v4.2.13","v4.2.14","v4.2.2","v4.2.3","v4.2.4","v4.2.5","v4.2.6","v4.2.7","v4.2.8","v4.2.9","v4.3-Beta.1","v4.3-Beta.3","v4.3-Beta.4","v4.3-Beta.5","v4.3.0","v4.3.1","v4.3.10","v4.3.11","v4.3.12","v4.3.13","v4.3.14","v4.3.15","v4.3.16","v4.3.17","v4.3.2","v4.3.3","v4.3.4","v4.3.5","v4.3.6","v4.3.7","v4.3.8","v4.3.9","v5.0-Beta.1","v5.0-Beta.2","v5.0-Beta.3","v5.0.0","v5.0.1","v5.0.2","v5.0.3","v5.0.4","v5.0.5","v5.0.6","v5.0.7","v5.0.8"]}],"products":[{"vendor":"admidio","product":"admidio"}],"references":[{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-rw74-vc9h-534j","tags":["x_refsource_CONFIRM","exploit","advisory","web"]},{"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.9","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41663","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rw74-vc9h-534j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41663.json","tags":["advisory"]},{"url":"https://github.com/Admidio/admidio","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-41663","title":"Admidio: CSRF on Admin Preferences Triggers Unauthorized Backup, .htaccess Write, and Email Send","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, several administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because SameSite=Lax cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page. This issue has been patched in version 5.0.9.","status":"published","published":"2026-05-07T03:00:11.696Z","modified":"2026-05-07T12:41:41.736Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T13:41:08.498858Z"}],"euvd":[{"id":"EUVD-2026-28278","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, several administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because SameSite=Lax cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page. This issue has been patched in version 5.0.9.","status":"published","published":"2026-05-07T03:00:11Z","modified":"2026-05-07T12:41:41Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low"}],"updated_at":"2026-11-02T19:05:15.366699Z"}],"ghsa":[{"id":"GHSA-rw74-vc9h-534j","title":"Admidio has CSRF on Admin Preferences that Triggers Unauthorized Backup, .htaccess Write, and Email Send","description":"## Summary\n\nSeveral administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because `SameSite=Lax` cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page.\n\n## Details\n\nIn `modules/preferences.php`, the `backup`, `test_email`, and `htaccess` modes accept GET parameters with no CSRF token check:\n\n```php\n// modules/preferences.php - backup mode\ncase 'backup':\n    // Creates full database dump and serves as download\n    // No CSRF token validation\n    $backupFile = $gDb-\u003ebackup();\n    // ... sends file to client\n    break;\n\ncase 'test_email':\n    // Sends test email from the server\n    // No CSRF token validation\n    break;\n\ncase 'htaccess':\n    // Writes .htaccess file to disk\n    // No CSRF token validation\n    break;\n```\n\nThe `save` mode in the same file validates CSRF via `getFormObject()`, confirming the developers intended CSRF protection but did not apply it to these other modes.\n\nBecause these are GET requests, `SameSite=Lax` browsers include session cookies on top-level cross-origin navigations, making CSRF exploitation trivial.\n\n## Proof of Concept\n\nSimplified attacker page (`csrf.html` hosted on attacker origin):\n\n```html\n\u003chtml\u003e\n\u003cbody\u003e\n\u003ch1\u003eLoading...\u003c/h1\u003e\n\u003c!-- Trigger backup creation on victim's browser --\u003e\n\u003cscript\u003ewindow.location = 'https://target-admidio.example.com/adm_program/modules/preferences.php?mode=backup';\u003c/script\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\nWhen an administrator visits this page, the browser navigates to the Admidio backup URL with full session cookies. The server generates a database dump and serves it as a download to the victim's browser. Note: the backup downloads to the victim's machine, not to the attacker. The attacker cannot read the response cross-origin.\n\nFor `htaccess` mode, the CSRF overwrites the `.htaccess` file on the server, disrupting the application. For `test_email` mode, it triggers email sends from the server, which an attacker can abuse for spam or to probe internal email infrastructure.\n\n## Impact\n\nAn attacker tricks an Admidio administrator into visiting a malicious page that triggers state-changing operations on the server:\n\n- **Backup creation**: forces the server to generate a full database dump. The backup downloads to the victim's browser, not to the attacker. However, repeated backup triggers can cause disk I/O and storage pressure on the server.\n- **htaccess modification**: overwrites the server's `.htaccess` file, breaking URL routing or disabling security headers.\n- **Test email**: fires email sends from the server, usable as a spam relay or to probe internal mail configuration.\n\nThe core issue is that state-changing operations run via unprotected GET requests. The victim only needs to visit a single attacker-controlled page while logged in.\n\n## Recommended Fix\n\n1. Change `backup`, `test_email`, and `htaccess` operations to require POST requests.\n2. Add CSRF token validation using the existing `getFormObject()` mechanism.\n3. As defense in depth, set `SameSite=Strict` on session cookies or add a confirmation step for destructive operations like database backup.\n\n---\n*Found by [aisafe.io](https://aisafe.io)*","status":"published","published":"2026-04-29T21:54:30Z","modified":"2026-05-08T20:13:59Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T14:40:04.762828Z"}],"nvd":[{"id":"CVE-2026-41663","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, several administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because SameSite=Lax cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page. This issue has been patched in version 5.0.9.","status":"published","published":"2026-05-07T04:16:30.243Z","modified":"2026-06-17T10:46:57.863Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low","assessor":"secondary"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T14:12:17.842772Z"}],"osv":[{"id":"CVE-2026-41663","title":"Admidio: CSRF on Admin Preferences Triggers Unauthorized Backup, .htaccess Write, and Email Send","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, several administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because SameSite=Lax cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page. This issue has been patched in version 5.0.9.","status":"published","published":"2026-05-07T03:00:11.696Z","modified":"2026-10-28T02:30:39.093417959Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T15:45:03.764807Z"},{"id":"GHSA-rw74-vc9h-534j","title":"Admidio has CSRF on Admin Preferences that Triggers Unauthorized Backup, .htaccess Write, and Email Send","description":"## Summary\n\nSeveral administrative operations in Admidio's preferences module (database backup, test email, htaccess generation) fire via GET requests with no CSRF token validation. Because `SameSite=Lax` cookies travel with top-level GET navigations, an attacker forces an authenticated admin to trigger these actions from a malicious page.\n\n## Details\n\nIn `modules/preferences.php`, the `backup`, `test_email`, and `htaccess` modes accept GET parameters with no CSRF token check:\n\n```php\n// modules/preferences.php - backup mode\ncase 'backup':\n    // Creates full database dump and serves as download\n    // No CSRF token validation\n    $backupFile = $gDb-\u003ebackup();\n    // ... sends file to client\n    break;\n\ncase 'test_email':\n    // Sends test email from the server\n    // No CSRF token validation\n    break;\n\ncase 'htaccess':\n    // Writes .htaccess file to disk\n    // No CSRF token validation\n    break;\n```\n\nThe `save` mode in the same file validates CSRF via `getFormObject()`, confirming the developers intended CSRF protection but did not apply it to these other modes.\n\nBecause these are GET requests, `SameSite=Lax` browsers include session cookies on top-level cross-origin navigations, making CSRF exploitation trivial.\n\n## Proof of Concept\n\nSimplified attacker page (`csrf.html` hosted on attacker origin):\n\n```html\n\u003chtml\u003e\n\u003cbody\u003e\n\u003ch1\u003eLoading...\u003c/h1\u003e\n\u003c!-- Trigger backup creation on victim's browser --\u003e\n\u003cscript\u003ewindow.location = 'https://target-admidio.example.com/adm_program/modules/preferences.php?mode=backup';\u003c/script\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\nWhen an administrator visits this page, the browser navigates to the Admidio backup URL with full session cookies. The server generates a database dump and serves it as a download to the victim's browser. Note: the backup downloads to the victim's machine, not to the attacker. The attacker cannot read the response cross-origin.\n\nFor `htaccess` mode, the CSRF overwrites the `.htaccess` file on the server, disrupting the application. For `test_email` mode, it triggers email sends from the server, which an attacker can abuse for spam or to probe internal email infrastructure.\n\n## Impact\n\nAn attacker tricks an Admidio administrator into visiting a malicious page that triggers state-changing operations on the server:\n\n- **Backup creation**: forces the server to generate a full database dump. The backup downloads to the victim's browser, not to the attacker. However, repeated backup triggers can cause disk I/O and storage pressure on the server.\n- **htaccess modification**: overwrites the server's `.htaccess` file, breaking URL routing or disabling security headers.\n- **Test email**: fires email sends from the server, usable as a spam relay or to probe internal mail configuration.\n\nThe core issue is that state-changing operations run via unprotected GET requests. The victim only needs to visit a single attacker-controlled page while logged in.\n\n## Recommended Fix\n\n1. Change `backup`, `test_email`, and `htaccess` operations to require POST requests.\n2. Add CSRF token validation using the existing `getFormObject()` mechanism.\n3. As defense in depth, set `SameSite=Strict` on session cookies or add a confirmation step for destructive operations like database backup.\n\n---\n*Found by [aisafe.io](https://aisafe.io)*","status":"published","published":"2026-04-29T21:54:30Z","modified":"2026-05-08T20:32:25.355827Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L","level":"low"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T15:46:56.281047Z"}]}}