{"id":182030,"date":"2026-06-12T02:48:17","date_gmt":"2026-06-12T00:48:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-phpbb-pozvolyayushhaya-poluchit-dostup-k-lyubomu-akkauntu-bez-autentifikaczii"},"modified":"2026-06-12T02:48:17","modified_gmt":"2026-06-12T00:48:17","slug":"uyazvimost-v-phpbb-pozvolyayushhaya-poluchit-dostup-k-lyubomu-akkauntu-bez-autentifikaczii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/uyazvimost-v-phpbb-pozvolyayushhaya-poluchit-dostup-k-lyubomu-akkauntu-bez-autentifikaczii","title":{"rendered":"Vulnerability in phpBB allows access to any account without authentication","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A vulnerability has been identified in the free forum creation engine phpBB that allows an attacker to connect to any forum user's session by sending a single HTTP request. This vulnerability is present in the default configuration of phpBB. The issue has been fixed in version phpBB 3.3.17.<\/p>\n

An attack on regular users can provide access to private messages and allow sending messages on behalf of the user. When targeting moderators and administrators, it is possible to delete other users' messages and view an IP address<\/a> emails, read private messages, but it is not possible to access the admin interface or gain access to the host. <\/p>\n

Details about the vulnerability are not provided, but using AI based on the patch, an exploitation method has been reconstructed, relying on a call to the handler 'login_link' with the authentication method 'auth_provider=apache' and substituting the login via Basic Auth. After this, PHP sets the environment variable 'PHP_AUTH_USER=login', and phpBB extracts the user's login without checking the password. For example, to obtain the session ID of the user admin and save it to the file cookies.txt, the following code can be executed:<\/p>\n

curl -i -s \\
\n -c cookies.txt \\
\n -b cookies.txt \\
\n -u 'admin:anything' \\
\n -d 'login=Login&login_username=admin&login_password=anything' \\
\n 'https:\/\/target.example\/forum\/ucp.php?mode=login_link&auth_provider=apache&login_link_any=1'
\n
Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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