# CVE-2020-5775: Server-side request forgery in Instructure Canvas Learning Management System (LMS)

> Remote unauthenticated attackers can force Canvas LMS to make arbitrary HTTP GET requests, potentially accessing internal resources or bypassing network restrictions.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-canvaslms-2020-5775, GHSA-wp9p-6x4v-9fxx

## What is CVE-2020-5775?

CVE-2020-5775 is a medium-severity server-side request forgery vulnerability in Instructure Canvas Learning Management System (LMS), published on 21 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Server-Side Request Forgery in Canvas LMS 2020-07-29 allows a remote, unauthenticated attacker to cause the Canvas application to perform HTTP GET requests to arbitrary domains.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2020-5775?

1 open source package ship an affected version, including canvaslms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `canvaslms` | Bitnami | From 2020-07-29.0.0 to 2020-07-29.0.0 | None |

Products: Instructure Canvas Learning Management Service.

## How do I fix CVE-2020-5775?

No fix has been published for CVE-2020-5775 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5775 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-5775 exists.

Public exploit code:

- Canvas LMS v2020-07-29 - Blind Server-Side Request Forgery (nuclei): http/cves/2020/CVE-2020-5775.yaml

## Other vulnerabilities in Instructure Canvas Learning Management System (LMS)

- [CVE-2021-36539](https://insights.sbomify.com/CVE-2021-36539/): Missing authorization in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5775 and fix it if it is affected.

What it is: CVE-2020-5775 is a medium-severity server-side request forgery vulnerability in Instructure Canvas Learning Management System (LMS), published on 21 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-5775 exists.

Affected packages and fixed versions:
- canvaslms (Bitnami): affected from 2020-07-29.0.0 up to 2020-07-29.0.0; no fix listed

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-2020-5775/ (Markdown: https://insights.sbomify.com/CVE-2020-5775/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5775
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5775
- OSV: https://osv.dev/vulnerability/CVE-2020-5775

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5775/
Summaries are generated and may contain mistakes; the official description above is the record.