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CVE-2026-34463— MantisBT has Stored HTML Injection/XSS via Clone Issue Form

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及之前版本存在跨站脚本漏洞，该漏洞源于克隆来自其他项目的问题时，克隆表单在类别选择器前添加源项目名称而未进行适当转义，可能导致存储型跨站脚本攻击。以下版本受到影响：2.28.1及之前版本。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
mantisbt mantisbt < 2.28.2 affected
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I. Basic Information for CVE-2026-34463

Vulnerability Information
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Vulnerability Title
MantisBT has Stored HTML Injection/XSS via Clone Issue Form
Source: CVE Program / CVE List V5
Vulnerability Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior contain a Stored XSS vulnerability. When cloning an issue originating from a Project other than the current one, the clone form (bug_report_page.php) prepends the source Project name before the category selector without proper escaping, allowing an attacker able to to inject HTML if they can set the Project's name (which typically requires manager or administrator access level). This issue has been resolved in version 2.28.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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 2.28.1及之前版本存在跨站脚本漏洞，该漏洞源于克隆来自其他项目的问题时，克隆表单在类别选择器前添加源项目名称而未进行适当转义，可能导致存储型跨站脚本攻击。以下版本受到影响：2.28.1及之前版本。
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 < 2.28.2 -

II. Public POCs for CVE-2026-34463

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III. Intelligence Information for CVE-2026-34463

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Patches & Fixes for CVE-2026-34463 (1)

Vendor Advisories for CVE-2026-34463 (2)

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

CVE-2026-34754 4.3 MEDIUM MantisBT allows unauthorized users to upload attachments to restricted issues via REST API
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-2026-34579 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-79

V. Comments for CVE-2026-34463

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