# CVE-2020-7936: Plone Open Redirect Vulnerability

> An open redirect in Plone allows attackers to craft links that redirect users to malicious sites, potentially after login.

- **Severity:** Medium 6.1 (`CVSS:3.1/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:** Yes
- **Published:** 23 Jan 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-82j9-wfcf-9v2h, PYSEC-2020-85

## What is CVE-2020-7936?

CVE-2020-7936 is a medium-severity vulnerability in Plone Plone, published on 23 Jan 2020. 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 on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site.

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

## Which versions are affected by CVE-2020-7936?

7 open source packages ship an affected version, including plone and Plone. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `plone` | PyPI | From 4.0 | 4.3.20 |
| `plone` | PyPI | From 4.0 | 5.2.2 |
| `plone` | PyPI | From 5.0rc1 | 5.1.7 |
| `plone` | PyPI | From 5.2.0 | 5.2.2 |
| `Plone` | PyPI | From 4.0 | 4.3.20 |
| `Plone` | PyPI | From 5.0rc1 | 5.1.7 |
| `Plone` | PyPI | From 5.2.0 | 5.2.2 |

Products: Plone Plone.

## How do I fix CVE-2020-7936?

Upgrade plone to a fixed version for your release line: 4.3.20, 5.2.2 or 5.1.7.

## Is CVE-2020-7936 being exploited?

There is no known exploitation of CVE-2020-7936 in the wild and no public exploit code.

## Other vulnerabilities in Plone Plone

- [CVE-2021-33509](https://insights.sbomify.com/CVE-2021-33509/): Incorrect Permission Assignment for Critical Resource in Plone (critical 9.9)
- [CVE-2020-35190](https://insights.sbomify.com/CVE-2020-35190/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2020-7941](https://insights.sbomify.com/CVE-2020-7941/): Plone Unauthenticated Write Vulnerability (critical 9.8)
- [CVE-2011-3587](https://insights.sbomify.com/CVE-2011-3587/): Zope Command Execution Vulnerability (critical 9.3)
- [CVE-2021-33926](https://insights.sbomify.com/CVE-2021-33926/): Server-Side Request Forgery in Plone CMS (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7936 and fix it if it is affected.

What it is: CVE-2020-7936 is a medium-severity vulnerability in Plone Plone, published on 23 Jan 2020. 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-2020-7936 in the wild and no public exploit code.

Affected packages and fixed versions:
- plone (PyPI): affected from 4.0; fixed in 4.3.20
- plone (PyPI): affected from 4.0; fixed in 5.2.2
- plone (PyPI): affected from 5.0rc1; fixed in 5.1.7
- plone (PyPI): affected from 5.2.0; fixed in 5.2.2
- Plone (PyPI): affected from 4.0; fixed in 4.3.20
- Plone (PyPI): affected from 5.0rc1; fixed in 5.1.7
- Plone (PyPI): affected from 5.2.0; fixed in 5.2.2

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-2020-7936/ (Markdown: https://insights.sbomify.com/CVE-2020-7936/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7936
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7936
- OSV: https://osv.dev/vulnerability/CVE-2020-7936

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7936/
Summaries are generated and may contain mistakes; the official description above is the record.