Summary
MantisBT has an authorization bypass that allows reading attachments after losing access to a private issue
MantisBT permits a user to list and download their own attachments from an Issue created by another user, even after that Issue becomes private and direct access to it is denied.
Workarounds
None.
Credits
Thanks to Vishal Shukla for discovering and responsibly reporting the issue.
Impact
The loss of confidentiality caused by this vulnerability is minimal, considering that only the attachments that were previously uploaded by the user themselves remains accessible.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2026-34744? CVE-2026-34744 is a medium-severity security vulnerability in mantisbt/mantisbt (composer), affecting versions <= 2.28.1. It is fixed in 2.28.2.
- Which versions of mantisbt/mantisbt are affected by CVE-2026-34744? mantisbt/mantisbt (composer) versions <= 2.28.1 is affected.
- Is there a fix for CVE-2026-34744? Yes. CVE-2026-34744 is fixed in 2.28.2. Upgrade to this version or later.
- Is CVE-2026-34744 exploitable, and should I be worried? Whether CVE-2026-34744 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-34744 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-34744? Upgrade
mantisbt/mantisbtto 2.28.2 or later.