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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2026-42858?
It affects 1 product.
Products include 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.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
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 openedx-translations's Atlas translations for Open edX missing validation
- CVE-2026-35404 Open edX Platform has an Open Redirect in Survey Views via Unvalidated redirect_url Parameter
- CVE-2026-42857 Open edX Platform: Stored CSS Injection in Email Notifications via Incomplete HTML Sanitization
Sources
Also known as GHSA-328g-7h4g-r2m9.