# CVE-2023-51639: Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability

> Remote attackers can bypass authentication and read arbitrary files via directory traversal in the downloadExportedChart action.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Nov 2024
- **Updated:** 25 Nov 2024
- **Also known as:** GHSA-g8p3-q878-476h

## What is CVE-2023-51639?

CVE-2023-51639 is a critical path traversal vulnerability in Allegra, published on 22 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability. 

The specific flaw exists within the downloadExportedChart action. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-22361.

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

## Which versions are affected by CVE-2023-51639?

It affects 1 product.


Products: Alltena Allegra.

## How do I fix CVE-2023-51639?

No fix has been published for CVE-2023-51639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-51639 being exploited?

There is no known exploitation of CVE-2023-51639 in the wild and no public exploit code.

## Other vulnerabilities in Allegra

- [CVE-2025-6216](https://insights.sbomify.com/CVE-2025-6216/): Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2023-51638](https://insights.sbomify.com/CVE-2023-51638/): Allegra Hard-coded Credentials Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2023-51641](https://insights.sbomify.com/CVE-2023-51641/): Allegra renderFieldMatch Deserialization of Unstrusted Data Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2023-51642](https://insights.sbomify.com/CVE-2023-51642/): Allegra loadFieldMatch Deserialization of Untrusted Data Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2023-51644](https://insights.sbomify.com/CVE-2023-51644/): Allegra SiteConfigAction Improper Access Control Remote Code Execution Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-51639 and fix it if it is affected.

What it is: CVE-2023-51639 is a critical path traversal vulnerability in Allegra, published on 22 Nov 2024. 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-2023-51639 in the wild and no public exploit code.

Affected product: Allegra. 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-2023-51639/ (Markdown: https://insights.sbomify.com/CVE-2023-51639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-51639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-51639
- OSV: https://osv.dev/vulnerability/CVE-2023-51639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-51639/
Summaries are generated and may contain mistakes; the official description above is the record.