PunBB 1.2.9 does not require password entry when changing the e-mail address in an account's profile, which might allow an attacker to make an address change via a hijacked login session.

PunBB 1.2.10 and earlier allows remote attackers to cause a denial of service (resource consumption) by registering many user accounts quickly.

PunBB 1.2.10 and earlier allows remote attackers to conduct brute force guessing attacks for an account's password, which may be as short as 4 characters.

Cross-site scripting (XSS) vulnerability in header.php in PunBB 1.2.10 allows remote attackers to inject arbitrary web script or HTML via the URL, which is not properly handled when the PHP_SELF variable is used to handle a pun_page tag.

Cross-site scripting (XSS) vulnerability in forum/viewtopic.php in PunBB 1.3 allows remote attackers to inject arbitrary web script or HTML via the pid parameter.

Multiple cross-site scripting (XSS) vulnerabilities in profile.php in PunBB before 1.3.4 allow remote attackers to inject arbitrary web script or HTML via the (1) password or (2) e-mail.

Multiple cross-site scripting (XSS) vulnerabilities in include/functions.php in PunBB before 1.3.6 allow remote attackers to inject arbitrary web script or HTML via the (1) id, (2) form_sent, (3) csrf_token, (4) req_confirm, or (5) delete parameter to delete.php, the (6) id, (7) form_sent, (8) csrf_token, (9) req_message, or (10) submit parameter to edit.php, the (11) action, (12) form_sent, (13) csrf_token, (14) req_email, or (15) request_pass parameter to login.php, the (16) email, (17) form_sent, (18) redirect_url, (19) csrf_token, (20) req_subject, (21) req_message, or (22) submit parameter to misc.php, the (23) action, (24) id, (25) form_sent, (26) csrf_token, (27) req_old_password, (28) req_new_password1, (29) req_new_password2, or (30) update parameter to profile.php, or the (31) action, (32) form_sent, (33) csrf_token, (34) req_username, (35) req_password1, (36) req_password2, (37) req_email1, (38) timezone, or (39) register parameter to register.php.