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Fix #15384: summary.php XSS vulnerability in MantisBT 1.2.12 only
Roland Becker (MantisBT Developer) discovered a XSS vulnerability introduced in MantisBT 1.2.12 with the display of category/project names on the summary.php page. A malicious MantisBT user holding privileged manager/administrator permissions could create a category or project name that contains JavaScript code. Any user visiting summary.php from that point on may then be exposed to having the malicious JavaScript execute within their browser environment. The severity of this issue is limited by the need to hold privileged manager/administrator permissions in order to modify category and project names. However -- there are many use cases where MantisBT installations can have hundreds of sub-projects, each managed by different people/parties that can not or should not be fully trusted. Refer to previous commits 3ca8a16 and 6ec3f69 to trace back the origin of this vulnerability.
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