# CVE-2026-42858: Open edX Platform: Server-Side Request Forgery (SSRF) in SAML Provider Data Sync Endpoint

> Authenticated Enterprise Admins can exploit an SSRF vulnerability in the SAML provider sync endpoint to access internal network services and cloud metadata.

- **Severity:** High 8.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-328g-7h4g-r2m9

## What is CVE-2026-42858?

CVE-2026-42858 is a high-severity server-side request forgery vulnerability in openedx-platform, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Open edX Platform enables the authoring and delivery of online learning at any scale. The sync_provider_data endpoint in SAMLProviderDataViewSet allows authenticated Enterprise Admin users to supply an arbitrary URL via the metadata_url POST parameter. This URL is passed directly to requests.get() in fetch_metadata_xml() without any URL validation, IP filtering, or scheme enforcement. An attacker with Enterprise Admin privileges can force the server to make HTTP requests to internal network services, cloud metadata endpoints (e.g., AWS 169.254.169.254), or other attacker-controlled destinations. This vulnerability is fixed by commit 6fda1f120ff5a590d120ae1180185525f399c6d0 and 70a56246dd9c9df57c596e64bdd8a11b1d9da054.

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

## Which versions are affected by CVE-2026-42858?

It affects 1 product.


Products: Openedx Openedx.

## How do I fix CVE-2026-42858?

No fix has been published for CVE-2026-42858 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-42858 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42858 exists.

## Other vulnerabilities in openedx-platform

- [CVE-2024-43782](https://insights.sbomify.com/CVE-2024-43782/): openedx-translations's Atlas translations for Open edX missing validation (high 7.7)
- [CVE-2026-35404](https://insights.sbomify.com/CVE-2026-35404/): Open edX Platform has an Open Redirect in Survey Views via Unvalidated redirect_url Parameter (medium 4.7)
- [CVE-2026-42857](https://insights.sbomify.com/CVE-2026-42857/): Open edX Platform: Stored CSS Injection in Email Notifications via Incomplete HTML Sanitization (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42858 and fix it if it is affected.

What it is: CVE-2026-42858 is a high-severity server-side request forgery vulnerability in openedx-platform, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42858 exists.

Affected product: openedx-platform. 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-2026-42858/ (Markdown: https://insights.sbomify.com/CVE-2026-42858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42858
- OSV: https://osv.dev/vulnerability/CVE-2026-42858

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42858/
Summaries are generated and may contain mistakes; the official description above is the record.