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EUVD-2026-277184

2026-10-05T00:30:13.956952+00:00

EUVD-2026-277184

fkie_cve-2026-33488

2026-10-05T00:30:13.956989+00:00

WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `createKeys()` function in the LoginControl plugin's PGP 2FA system generates 512-bit RSA keys, which have been publicly factorable since 1999. An attacker who obtains a target user's public key can factor the 512-bit RSA modulus on commodity hardware in hours, derive the complete private key, and decrypt any PGP 2FA challenge issued by the system — completely bypassing the second authentication factor. Additionally, the `generateKeys.json.php` and `encryptMessage.json.php` endpoints lack any authentication checks, exposing CPU-intensive key generation to anonymous users. Commit 00d979d87f8182095c8150609153a43f834e351e contains a patch.

GHSA-6m5f-j7w2-w953 — AVideo has a PGP 2FA Bypass via Cryptographically Broken 512-bit RSA Key Generation in LoginControl Plugin

2026-10-05T00:30:13.957029+00:00

Affected: Packagist: wwbn/avideo

## Summary

The `createKeys()` function in the LoginControl plugin's PGP 2FA system generates 512-bit RSA keys, which have been publicly factorable since 1999. An attacker who obtains a target user's public key can factor the 512-bit RSA modulus on commodity hardware in hours, derive the complete private key, and decrypt any PGP 2FA challenge issued by the system — completely bypassing the second authentication factor. Additionally, the `generateKeys.json.php` and `encryptMessage.json.php` endpoints lack any authentication checks, exposing CPU-intensive key generation to anonymous users.

## Details

The vulnerability originates in `plugin/LoginControl/pgp/functions.php` at line 26:

```php // plugin/LoginControl/pgp/functions.php:26 $privateKey = RSA::createKey(512); ```

This code was copied from the `singpolyma/openpgp-php` library's example/demo code, which was never intended for production use. The entire PGP 2FA flow relies on these weak keys:

1. **Key generation**: When a user enables PGP 2FA, the UI calls `createKeys()` which generates a 512-bit RSA keypair. The public key is saved to the database via `savePublicKey.json.php`.

2. **Challenge creation** (`LoginControl.php:520-531`): During login, a `uniqid()` token is generated, stored in the session, and encrypted with the user's stored public key: ```php // LoginControl.php:525-530 $_SESSION['user']['challenge']['text'] = uniqid(); $encMessage = self::encryptPGPMessage(User::getId(), $_SESSION['user']['challenge']…