CVE-2026-42858: Open edX Platform enables the authoring and delivery of online learning at any scale

Q: How do I fix CVE-2026-42858?

openedx: upgrade to 2026-04-24. Exact commands for each OS are on this page.

Q: Is CVE-2026-42858 being exploited?

CVE-2026-42858 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42858 affect?

CVE-2026-42858 affects openedx. Severity is high (CVSS 8.5). 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 POS

Q: How urgent is CVE-2026-42858?

Priority 43/100. High severity; Public exploit reference

This month

HIGH 8.5UPGRADE

CVE-2026-42858 is a high-severity flaw (CVSS 8.5) affecting openedx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ser

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-11
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: openedx

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 18:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

openedx openedx UPGRADE

Affected: < 2026-04-24

Fixed in: 2026-04-24

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openedx || rpm -q openedx || openedx --version

2. UPGRADE to 2026-04-24 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openedx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openedx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42858?

openedx: upgrade to 2026-04-24. Exact commands for each OS are on this page.

Is CVE-2026-42858 being exploited?

CVE-2026-42858 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42858 affect?

CVE-2026-42858 affects openedx. Severity is high (CVSS 8.5). 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 POS

How urgent is CVE-2026-42858?

Priority 43/100. High severity; Public exploit reference

Related CVEs

CVE-2026-42857 MEDIUM 4.6 UPGRADE Open edX Platform enables the authoring and delivery of online learning at any scale

References

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