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CVE-2026-42858

8.5 · HIGH

Open edX Platform enables the authoring and delivery of online learning at any scale.

Published May 11, 2026CWE-918EPSS 0.45%

Overview

CVE-2026-42858 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/openedx/openedx-platform/commit/6fda1f120ff5a590d120ae1180185525f399c6d0GitHubgithub.com/openedx/openedx-platform/commit/70a56246dd9c9df57c596e64bdd8a11b1d9da054GitHubgithub.com/openedx/openedx-platform/security/advisories/GHSA-328g-7h4g-r2m9GitHubgithub.com/openedx/openedx-platform/security/advisories/GHSA-328g-7h4g-r2m9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42858?

CVE-2026-42858 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

How severe is CVE-2026-42858?

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-42858?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42858?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42858 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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