CVE-2026-39960— MantisBT is Vulnerable to Stored XSS through Custom Field Textarea Values

MantisBT is Vulnerable to Stored XSS through Custom Field Textarea Values

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Mantis Bug Tracker 跨站脚本漏洞

Mantis Bug Tracker（MantisBT）是Mantis Bug Tracker开源的一个 bug 跟踪器。 Mantis Bug Tracker 2.28.1及之前版本存在跨站脚本漏洞，该漏洞源于更新问题页面中文本区域自定义字段内容转义不当，可能导致攻击者注入HTML并在页面加载时执行任意JavaScript，从而窃取会话导致管理员账户接管和项目数据完全访问。

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