# CVE-2021-27367: Path traversal in bolt/core

> Attackers can exploit directory traversal in Bolt CMS file controllers to read or modify arbitrary files on the server.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:** 17 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-q88g-qx42-xfrh

## What is CVE-2021-27367?

CVE-2021-27367 is a high-severity path traversal vulnerability in n/a, published on 17 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Controller/Backend/FileEditController.php and Controller/Backend/FilemanagerController.php in Bolt before 4.1.13 allow Directory Traversal.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2021-27367?

2 open source packages ship an affected version, including bolt/core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `bolt/core` | Packagist | All versions | 4.1.13 |
| `bolt/core` | Packagist | All versions | 4.1.13 |

Products: Boltcms Bolt.

## How do I fix CVE-2021-27367?

Upgrade bolt/core to 4.1.13 or later.

## Is CVE-2021-27367 being exploited?

There is no known exploitation of CVE-2021-27367 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-31321](https://insights.sbomify.com/CVE-2022-31321/): Path traversal in n/a (critical 9.1)
- [CVE-2019-10874](https://insights.sbomify.com/CVE-2019-10874/): Bolt Cross Site Request Forgery (CSRF) (high 8.8)
- [CVE-2019-9185](https://insights.sbomify.com/CVE-2019-9185/): Bolt Unrestricted Upload of File with Dangerous Type (high 8.8)
- [CVE-2020-4040](https://insights.sbomify.com/CVE-2020-4040/): CSRF issue on preview pages in Bolt CMS (high 8.6)
- [CVE-2025-34086](https://insights.sbomify.com/CVE-2025-34086/): Bolt CMS Authenticated Remote Code Execution via Profile Injection and File Rename (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27367 and fix it if it is affected.

What it is: CVE-2021-27367 is a high-severity path traversal vulnerability in n/a, published on 17 Feb 2021. 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-2021-27367 in the wild and no public exploit code.

Affected packages and fixed versions:
- bolt/core (Packagist): affected all versions; fixed in 4.1.13
- bolt/core (Packagist): affected all versions; fixed in 4.1.13

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-2021-27367/ (Markdown: https://insights.sbomify.com/CVE-2021-27367/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27367
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27367
- OSV: https://osv.dev/vulnerability/CVE-2021-27367

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27367/
Summaries are generated and may contain mistakes; the official description above is the record.