pmwiki.php in PmWiki 2.1 beta 20, with register_globals enabled, allows remote attackers to bypass protection mechanisms that deregister global variables by setting both a GPC variable and a GLOBALS[] variable with the same name, which causes PmWiki to unset the GLOBALS[] variable but not the GPC variable, which creates resultant vulnerabilities such as remote file inclusion and cross-site scripting (XSS).

Cross-site scripting (XSS) vulnerability in the Search module in PmWiki up to 2.0.12 allows remote attackers to inject arbitrary web script or HTML via the q parameter.

Cross-site scripting (XSS) vulnerability in (1) uploads.php and (2) "url links" in PmWiki 2.1.6 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified parameters.

Cross-site scripting (XSS) vulnerability in PmWiki before 2.1.18 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors involving "table markups".

The PageListSort function in scripts/pagelist.php in PmWiki 2.x before 2.2.35 allows remote attackers to execute arbitrary code via PHP sequences in a crafted order parameter in a pagelist directive, leading to unintended use of the PHP create_function function.

Cross-site scripting (XSS) vulnerability in the table feature in PmWiki 2.2.15 allows remote authenticated users to inject arbitrary web script or HTML via the width attribute.

Cross-site scripting (XSS) vulnerability in pmwiki.php in PmWiki 2.2.20 allows remote attackers to inject arbitrary web script or HTML via the from parameter to Main/WikiSandbox. NOTE: some of these details are obtained from third party information.

PmWiki before 2.2.21 has XSS.