Is CVE-2026-42858 actively exploited?

No active exploitation of CVE-2026-42858 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42858 be exploited remotely?

Yes. CVE-2026-42858 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42858?

CVE-2026-42858 has a CVSS score of 9.9 (CRITICAL).

HOME VULNERABILITIESCVE-2026-42858

CRITICAL

CVE-2026-42858

CWE-918Published: May 11, 2026· Updated: May 13, 2026

9.9

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.7th

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.

NVD Source

Technical Analysis

CVE-2026-42858 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.9.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.