What is CVE-2026-42858?

CVE-2026-42858 is a high-severity vulnerability in Openedx, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-05-11.

How severe is CVE-2026-42858?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in Openedx

CVE-2026-42858

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.004 (31.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Openedx
Openedx Openedx-platform — versions < 6fda1f120ff5a590d120ae1180185525f399c6d0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42858?: CVE-2026-42858 is a high-severity vulnerability in Openedx, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-05-11.
How severe is CVE-2026-42858?: High severity. CVSS v3 base score is 8.5 out of 10.