# CVE-2020-13565: Open redirect in phpGACL

> An attacker can craft a URL to redirect users to arbitrary sites via the return_page functionality in OpenEMR and phpGACL.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-ccp4-42w5-9q8g, UBUNTU-CVE-2020-13565

## What is CVE-2020-13565?

CVE-2020-13565 is a medium-severity vulnerability in Open-Emr Openemr, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An open redirect vulnerability exists in the return_page redirection functionality of phpGACL 3.3.7, OpenEMR 5.0.2 and OpenEMR development version 6.0.0 (commit babec93f600ff1394f91ccd512bcad85832eb6ce). A specially crafted HTTP request can redirect users to an arbitrary URL. An attacker can provide a crafted URL to trigger this vulnerability.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2020-13565?

It affects 2 products.


Products: Open-Emr Openemr, Phpgacl Project Phpgacl.

## How do I fix CVE-2020-13565?

No fix has been published for CVE-2020-13565 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-13565 being exploited?

There is no known exploitation of CVE-2020-13565 in the wild and no public exploit code.

## Other vulnerabilities in Open-Emr Openemr

- [CVE-2026-24898](https://insights.sbomify.com/CVE-2026-24898/): OpenEMR has an Unauthenticated MedEx Token Disclosure (critical 10.0)
- [CVE-2026-24849](https://insights.sbomify.com/CVE-2026-24849/): OpenEMR Arbitrary File Read Vulnerability (critical 10.0)
- [CVE-2026-24908](https://insights.sbomify.com/CVE-2026-24908/): OpenEMR has SQL Injection in Patient API Sort Parameter (critical 10.0)
- [CVE-2022-2734](https://insights.sbomify.com/CVE-2022-2734/): Improper Restriction of Rendered UI Layers or Frames in openemr/openemr (critical 10.0)
- [CVE-2024-22611](https://insights.sbomify.com/CVE-2024-22611/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13565 and fix it if it is affected.

What it is: CVE-2020-13565 is a medium-severity vulnerability in Open-Emr Openemr, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-13565 in the wild and no public exploit code.

Affected product: Open-Emr Openemr. 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-2020-13565/ (Markdown: https://insights.sbomify.com/CVE-2020-13565/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13565
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13565
- OSV: https://osv.dev/vulnerability/CVE-2020-13565

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13565/
Summaries are generated and may contain mistakes; the official description above is the record.