The Timeline feature in myviewpage.php in MantisBT through 2.21.1 has a stored cross-site scripting (XSS) vulnerability, allowing execution of arbitrary code (if CSP settings permit it) after uploading an attachment with a crafted filename. The code is executed for any user having visibility to the issue, whenever My View Page is displayed.
{
"nvd_published_at": "2019-08-21T19:15:00Z",
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2025-05-29T15:23:48Z",
"severity": "MODERATE"
}