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CVE-2026-44657— MantisBT: Stored XSS in File Download

Quick assessment

Affected
mantisbt mantisbt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mantis Bug Tracker（MantisBT）是Mantis Bug Tracker开源的一个 bug 跟踪器。 Mantis Bug Tracker 2.28.2之前版本存在跨站脚本漏洞，该漏洞源于使用show_inline=1参数和有效CSRF令牌时，攻击者可通过上传特制XHTML附件引用JavaScript附件执行代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.58% · P46

Affected Version Matrix 1

VendorProduct Version RangeStatus
mantisbt mantisbt < 2.28.2 affected
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I. Basic Information for CVE-2026-44657

Vulnerability Information
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Vulnerability Title
MantisBT: Stored XSS in File Download
Source: CVE Program / CVE List V5
Vulnerability Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Prior to 2.28.2, using show_inline=1 parameter and a valid file_show_inline_token CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment. This vulnerability is fixed in 2.28.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mantis Bug Tracker 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mantis Bug Tracker（MantisBT）是Mantis Bug Tracker开源的一个 bug 跟踪器。 Mantis Bug Tracker 2.28.2之前版本存在跨站脚本漏洞，该漏洞源于使用show_inline=1参数和有效CSRF令牌时，攻击者可通过上传特制XHTML附件引用JavaScript附件执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mantisbt mantisbt < 2.28.2 -

II. Public POCs for CVE-2026-44657

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III. Intelligence Information for CVE-2026-44657

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Patches & Fixes for CVE-2026-44657 (2)

Vendor Advisories for CVE-2026-44657 (2)

Same Patch Batch · mantisbt · 2026-05-28 · 5 CVEs total

CVE-2026-41897 MantisBT: Reflected XSS in Rendering Dynamic Custom Textarea Field
CVE-2026-42071 MantisBT: Private Bugnote Attachment Content Leak via REST API
CVE-2026-42070 MantisBT: Authorization Bypass in Bugnote Editing via Issue Update API
CVE-2026-44655 MantisBT: Stored XSS on Move Attachments Admin Page

IV. Related Vulnerabilities

Same product: mantisbt
Same vendor: mantisbt
Same weakness: CWE-79

V. Comments for CVE-2026-44657

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