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CVE-2026-42071— MantisBT: Private Bugnote Attachment Content Leak via REST API

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之前版本存在安全漏洞，该漏洞源于文件可见性函数缺少授权检查，允许认证用户通过REST API和SOAP API下载私有bugnotes的附件。以下版本受到影响：2.23.0至2.28.1版本。

AI Predicted 6.5 Difficulty: Easy EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
mantisbt mantisbt >= 2.23.0, < 2.28.2 affected
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I. Basic Information for CVE-2026-42071

Vulnerability Information
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Vulnerability Title
MantisBT: Private Bugnote Attachment Content Leak via REST API
Source: CVE Program / CVE List V5
Vulnerability Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. From 2.23.0 to 2.28.1, a missing authorization check in MantisBT's file visibility function allows any authenticated user (REPORTER+) to download attachments on private bugnotes they should not be able to access, via the REST API endpoint GET /api/rest/issues/{id}/files and SOAP API mc_issue_attachment_get endpoint. This vulnerability is fixed in 2.28.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mantis Bug Tracker 安全漏洞
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之前版本存在安全漏洞，该漏洞源于文件可见性函数缺少授权检查，允许认证用户通过REST API和SOAP API下载私有bugnotes的附件。以下版本受到影响：2.23.0至2.28.1版本。
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 >= 2.23.0, < 2.28.2 -

II. Public POCs for CVE-2026-42071

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III. Intelligence Information for CVE-2026-42071

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Patches & Fixes for CVE-2026-42071 (1)

Vendor Advisories for CVE-2026-42071 (4)

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

CVE-2026-41897 MantisBT: Reflected XSS in Rendering Dynamic Custom Textarea Field
CVE-2026-42070 MantisBT: Authorization Bypass in Bugnote Editing via Issue Update API
CVE-2026-44657 MantisBT: Stored XSS in File Download
CVE-2026-44655 MantisBT: Stored XSS on Move Attachments Admin Page

IV. Related Vulnerabilities

Same product: mantisbt
Same vendor: mantisbt
Same weakness: CWE-862

V. Comments for CVE-2026-42071

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