# CVE-2014-6387: Auth bypass in n/a

> Remote attackers can bypass authentication in MantisBT by using a password starting with a null byte, gaining unauthorized access.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Oct 2014
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-2vwf-xc9m-9w4j

## What is CVE-2014-6387?

CVE-2014-6387 is a medium-severity authentication bypass vulnerability in Mantisbt Mantisbt, published on 22 Oct 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

gpc_api.php in MantisBT 1.2.17 and earlier allows remote attackers to bypass authenticated via a password starting will a null byte, which triggers an unauthenticated bind.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2014-6387?

It affects 1 product.


Products: Mantisbt Mantisbt.

## How do I fix CVE-2014-6387?

Upgrade to a fixed version.

## Is CVE-2014-6387 being exploited?

There is no known exploitation of CVE-2014-6387 in the wild and no public exploit code.

## Other vulnerabilities in Mantisbt Mantisbt

- [CVE-2019-15074](https://insights.sbomify.com/CVE-2019-15074/): MantisBT allows cross-site scripting (XSS) via crafted filename (critical 9.6)
- [CVE-2026-30849](https://insights.sbomify.com/CVE-2026-30849/): MantisBT SOAP API has an authentication bypass vulnerability on MySQL (critical 9.3)
- [CVE-2025-47776](https://insights.sbomify.com/CVE-2025-47776/): MantisBT: Authentication bypass for some passwords due to PHP type juggling (high 8.8)
- [CVE-2017-7615](https://insights.sbomify.com/CVE-2017-7615/): MantisBT allows arbitrary password reset (high 8.8)
- [CVE-2026-33517](https://insights.sbomify.com/CVE-2026-33517/): MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-6387 and fix it if it is affected.

What it is: CVE-2014-6387 is a medium-severity authentication bypass vulnerability in Mantisbt Mantisbt, published on 22 Oct 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2014-6387 in the wild and no public exploit code.

Affected product: Mantisbt Mantisbt. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2014-6387/ (Markdown: https://insights.sbomify.com/CVE-2014-6387/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-6387
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-6387
- OSV: https://osv.dev/vulnerability/CVE-2014-6387

---
From sbomify Insights: https://insights.sbomify.com/CVE-2014-6387/
Summaries are generated and may contain mistakes; the official description above is the record.