Cross-site request forgery (CSRF) vulnerability in index.php in FlatNuke 2.6, and possibly 3, allows remote attackers to change the password and privilege level of arbitrary accounts via the user parameter and modified (1) regpass and (2) level parameters in a none_Login action, as demonstrated by using a Flash object to automatically make the request.

Direct code injection vulnerability in FlatNuke 2.5.1 allows remote attackers to execute arbitrary PHP code by placing the code into the url_avatar field.

FlatNuke 2.5.3 allows remote attackers to cause a denial of service or obtain sensitive information via (1) a direct request to foot_news.php, which triggers an infinite loop, or (2) direct requests to unknown scripts, which reveals the web document root in an error message.

FlatNuke 2.5.3 allows remote attackers to obtain sensitive information via invalid parameters to certain scripts, which leaks the web document root in an error message.

Direct code injection vulnerability in FlatNuke 2.5.3 allows remote attackers to execute arbitrary PHP code by placing the code into the Referer header of an HTTP request, which causes the code to be injected into referer.php, which can then be accessed by the attacker.

Cross-site scripting (XSS) vulnerability in FlatNuke 2.5.3 allows remote attackers to inject arbitrary web script or HTML via the border or back parameters to (1) help.php or (2) footer.php.

Directory traversal vulnerability in thumb.php in FlatNuke 2.5.3 allows remote attackers to read arbitrary images or obtain the installation path via the image parameter.

FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to obtain sensitive information via a direct request to structure.php.

FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to obtain sensitive information via (1) a null byte or (2) an MS-DOS device name such as AUX, CON, PRN, COM1, or LPT1 in the mod parameter.

Multiple cross-site scripting (XSS) vulnerabilities in FlatNuke 2.5.5 and possibly earlier versions allow remote attackers to inject arbitrary web script or HTML via the (1) bodycolor, (2) backimage, (3) theme, or (4) logo parameter to structure.php, (5) admin, (6) admin_mail, or (7) back parameter to footer.php, or (8) the message body in a news post.

CRLF injection vulnerability in FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to execute arbitrary PHP commands via an ASCII char 13 (carriage return) in the signature field, which is injected into a PHP script without a preceding comment character, which can then be executed by a direct request.

index.php in FlatNuke 2.5.1 allows remote attackers to create an administrator account via carriage returns and #10 in the url_avatar field, which is interpreted as a sensitive directive.

Cross-site scripting (XSS) vulnerability in FlatNuke 2.5.6 allows remote attackers to inject arbitrary web script or HTML via the usr parameter in a vis_reg operation to index.php.

print.php in FlatNuke 2.5.6 allows remote attackers to obtain sensitive information (path disclosure on error) or cause a denial of service (resource consumption) via an MS-DOS device name in the news parameter to print.php, such as (1) AUX, (2) CON, (3) PRN, (4) COM1, or (5) LPT1.

Cross-site scripting (XSS) vulnerability in index.php for FlatNuke 2.5.6 allows remote attackers to inject arbitrary web script or HTML via the user parameter in a profile operation, a different vulnerability than CVE-2005-2814. NOTE: it is possible that this XSS is a resultant vulnerability of CVE-2005-3307.

Directory traversal vulnerability in index.php for FlatNuke 2.5.6 allows remote attackers to read arbitrary files via ".." sequences in the (1) user parameter in a profile operation or (2) quale parameter in a newtopic operation.

Cross-site scripting (XSS) vulnerability in forum/index.php in FlatNuke 2.5.6 allows remote attackers to inject arbitrary web script or HTML via the nome parameter in a login operation, a variant of CVE-2005-3306.

Directory traversal vulnerability in Flatnuke 2.5.6 allows remote attackers to access arbitrary files via a .. (dot dot) and null byte (%00) in the id parameter of the read module.

FlatNuke 2.5.6 verifies authentication credentials based on an MD5 checksum of the admin name and the hashed password rather than the plaintext password, which allows attackers to gain privileges by obtaining the password hash (possibly via CVE-2005-2813), then calculating the credentials and including them in the secid cookie.

verify.php in FlatNuke 2.5.6 allows remote authenticated administrators to modify arbitrary PHP files by setting the file parameter to an arbitrary file and injecting the code into the body parameter. NOTE: if a FlatNuke administrator is normally assumed to be able to modify arbitrary content, then this issue does not cross privilege boundaries and would not be a vulnerability.