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CVE-2026-34754— MantisBT allows unauthorized users to upload attachments to restricted issues 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 2.28.1及之前版本存在访问控制错误漏洞，该漏洞源于允许已认证用户上传附件到其无权访问的私有问题。

CVSS 4.3 · Medium EPSS 0.33% · P23

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
mantisbt mantisbt < 2.28.2 affected
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I. Basic Information for CVE-2026-34754

Vulnerability Information
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Vulnerability Title
MantisBT allows unauthorized users to upload attachments to restricted issues via REST API
Source: CVE Program / CVE List V5
Vulnerability Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior allow an authenticated user to upload attachments to private Issues they are not authorized to access. This issue has been fixed in version 2.28.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mantis Bug Tracker（MantisBT） 访问控制错误漏洞
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 2.28.1及之前版本存在访问控制错误漏洞，该漏洞源于允许已认证用户上传附件到其无权访问的私有问题。
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-2026-34754

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III. Intelligence Information for CVE-2026-34754

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Patches & Fixes for CVE-2026-34754 (2)

Vendor Advisories for CVE-2026-34754 (1)

Same Patch Batch · mantisbt · 2026-05-19 · 7 CVEs total

CVE-2026-33052 MantisBT: Authorization Bypass in Global Profile Creation
CVE-2026-34744 MantisBT authorization bypass allows continued access to self-uploaded attachments on priv
CVE-2026-34463 MantisBT has Stored HTML Injection/XSS via Clone Issue Form
CVE-2026-34579 MantisBT has an authorization bypass via private issue monitoring
CVE-2026-34390 MantisBT: Privilege Escalation from Manager to Administrator
CVE-2026-34970 MantisBT Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked

IV. Related Vulnerabilities

Same product: mantisbt
Same vendor: mantisbt
Same weakness: CWE-284

V. Comments for CVE-2026-34754

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