Vulnerability-Lookup

CVE-2026-41660 (GCVE-0-2026-41660)

Vulnerability from cvelistv5 – Published: 2026-05-07 02:59 – Updated: 2026-05-07 12:44

Title

Admidio: Inverted 2FA Reset Authorization Check Lets Group Leaders Strip Admin TOTP

Summary

Admidio is an open-source user management solution. Prior to version 5.0.9, a logic error in Admidio's two-factor authentication reset inverts the authorization check. Non-admin users cannot remove their own TOTP configuration, but they can remove other users' TOTP, including administrators. A group leader with profile edit rights on an admin account can strip that admin's 2FA. This issue has been patched in version 5.0.9.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/Admidio/admidio/security/advis…	x_refsource_CONFIRM
	https://github.com/Admidio/admidio/releases/tag/v5.0.9	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Admidio	admidio	Affected: < 5.0.9

Show details on NVD website

JSON

To clipboard

{
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GHSA-RH3W-4CCX-PRF9

Vulnerability from github – Published: 2026-04-29 21:49 – Updated: 2026-04-29 21:49

Summary

Admidio has Inverted 2FA Reset Authorization Check that Lets Group Leaders Strip Admin TOTP

Details

Summary

A logic error in Admidio's two-factor authentication reset inverts the authorization check. Non-admin users cannot remove their own TOTP configuration, but they can remove other users' TOTP, including administrators. A group leader with profile edit rights on an admin account can strip that admin's 2FA.

Details

In modules/profile/two_factor_authentication.php at line 84, the authorization check uses an inverted condition:

// modules/profile/two_factor_authentication.php line 84
if (!($gCurrentUser->isAdministrator() || $gCurrentUserId !== $userId))
{
    throw new AdmException('SYS_NO_RIGHTS');
}

By De Morgan's law, this condition evaluates as: - Blocks when: NOT isAdministrator() AND $gCurrentUserId === $userId - In practice: blocks non-admins from resetting their OWN 2FA - Passes: non-admins resetting OTHER users' 2FA (the opposite of the intended behavior)

The intended logic should block non-admins from resetting other users' 2FA. The !== operator on line 84 should be ===.

A group leader who holds hasRightEditProfile() permission on an admin user (checked earlier in the flow) can exploit this to strip 2FA from administrator accounts, reducing their security to password-only authentication.

Proof of Concept

As testuser (a non-admin group leader with edit rights on admin profiles), send:

POST /adm_program/modules/profile/two_factor_authentication.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: ADMIDIO_..._SESSION_ID=<testuser_session>

mode=reset&user_uuid=<admin_user_uuid>

Result: the server removes 2FA from the admin account.

As testuser, attempt to reset their own 2FA:

POST /adm_program/modules/profile/two_factor_authentication.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: ADMIDIO_..._SESSION_ID=<testuser_session>

mode=reset&user_uuid=<testuser_user_uuid>

Result: SYS_NO_RIGHTS error. The user cannot reset their own 2FA.

This confirms the authorization logic is inverted.

Impact

A group leader (or any user with profile edit rights on an admin) can disable two-factor authentication on administrator accounts. This degrades admin account security to password-only, opening the door to credential stuffing or brute force attacks without a 2FA barrier.

Recommended Fix

Change !== to === on line 84 of modules/profile/two_factor_authentication.php:

// Fixed condition: block non-admins from resetting OTHER users' 2FA
if (!($gCurrentUser->isAdministrator() || $gCurrentUserId === $userId))
{
    throw new AdmException('SYS_NO_RIGHTS');
}

Found by aisafe.io

Severity ?

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.8"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "admidio/admidio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41660"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-29T21:49:24Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nA logic error in Admidio\u0027s two-factor authentication reset inverts the authorization check. Non-admin users cannot remove their own TOTP configuration, but they can remove other users\u0027 TOTP, including administrators. A group leader with profile edit rights on an admin account can strip that admin\u0027s 2FA.\n\n## Details\n\nIn `modules/profile/two_factor_authentication.php` at line 84, the authorization check uses an inverted condition:\n\n```php\n// modules/profile/two_factor_authentication.php line 84\nif (!($gCurrentUser-\u003eisAdministrator() || $gCurrentUserId !== $userId))\n{\n    throw new AdmException(\u0027SYS_NO_RIGHTS\u0027);\n}\n```\n\nBy De Morgan\u0027s law, this condition evaluates as:\n- Blocks when: `NOT isAdministrator() AND $gCurrentUserId === $userId`\n- In practice: blocks non-admins from resetting their OWN 2FA\n- Passes: non-admins resetting OTHER users\u0027 2FA (the opposite of the intended behavior)\n\nThe intended logic should block non-admins from resetting other users\u0027 2FA. The `!==` operator on line 84 should be `===`.\n\nA group leader who holds `hasRightEditProfile()` permission on an admin user (checked earlier in the flow) can exploit this to strip 2FA from administrator accounts, reducing their security to password-only authentication.\n\n## Proof of Concept\n\n1. As `testuser` (a non-admin group leader with edit rights on admin profiles), send:\n\n```http\nPOST /adm_program/modules/profile/two_factor_authentication.php HTTP/1.1\nContent-Type: application/x-www-form-urlencoded\nCookie: ADMIDIO_..._SESSION_ID=\u003ctestuser_session\u003e\n\nmode=reset\u0026user_uuid=\u003cadmin_user_uuid\u003e\n```\n\nResult: the server removes 2FA from the admin account.\n\n2. As `testuser`, attempt to reset their own 2FA:\n\n```http\nPOST /adm_program/modules/profile/two_factor_authentication.php HTTP/1.1\nContent-Type: application/x-www-form-urlencoded\nCookie: ADMIDIO_..._SESSION_ID=\u003ctestuser_session\u003e\n\nmode=reset\u0026user_uuid=\u003ctestuser_user_uuid\u003e\n```\n\nResult: `SYS_NO_RIGHTS` error. The user cannot reset their own 2FA.\n\nThis confirms the authorization logic is inverted.\n\n## Impact\n\nA group leader (or any user with profile edit rights on an admin) can disable two-factor authentication on administrator accounts. This degrades admin account security to password-only, opening the door to credential stuffing or brute force attacks without a 2FA barrier.\n\n## Recommended Fix\n\nChange `!==` to `===` on line 84 of `modules/profile/two_factor_authentication.php`:\n\n```php\n// Fixed condition: block non-admins from resetting OTHER users\u0027 2FA\nif (!($gCurrentUser-\u003eisAdministrator() || $gCurrentUserId === $userId))\n{\n    throw new AdmException(\u0027SYS_NO_RIGHTS\u0027);\n}\n```\n\n---\n*Found by [aisafe.io](https://aisafe.io)*",
  "id": "GHSA-rh3w-4ccx-prf9",
  "modified": "2026-04-29T21:49:24Z",
  "published": "2026-04-29T21:49:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-rh3w-4ccx-prf9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Admidio/admidio"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Admidio has Inverted 2FA Reset Authorization Check that Lets Group Leaders Strip Admin TOTP"
}

FKIE_CVE-2026-41660

Vulnerability from fkie_nvd - Published: 2026-05-07 04:16 - Updated: 2026-05-07 14:51

Severity ?

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Admidio/admidio/releases/tag/v5.0.9
	security-advisories@github.com	https://github.com/Admidio/admidio/security/advisories/GHSA-rh3w-4ccx-prf9
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Admidio/admidio/security/advisories/GHSA-rh3w-4ccx-prf9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Admidio is an open-source user management solution. Prior to version 5.0.9, a logic error in Admidio\u0027s two-factor authentication reset inverts the authorization check. Non-admin users cannot remove their own TOTP configuration, but they can remove other users\u0027 TOTP, including administrators. A group leader with profile edit rights on an admin account can strip that admin\u0027s 2FA. This issue has been patched in version 5.0.9."
    }
  ],
  "id": "CVE-2026-41660",
  "lastModified": "2026-05-07T14:51:01.740",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-07T04:16:29.740",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Admidio/admidio/releases/tag/v5.0.9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-rh3w-4ccx-prf9"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-rh3w-4ccx-prf9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-41660 (GCVE-0-2026-41660)

GHSA-RH3W-4CCX-PRF9

Summary

Details

Proof of Concept

Impact

Recommended Fix

FKIE_CVE-2026-41660

Tags

Sightings

Nomenclature