What’s Vulnerable › Vulnerabilities

CVE-2020-5228: Opencast allows unauthorized public access via OAI-PMH

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-30 · updated 2026-06-17
• Weakness: CWE-862

Description

Opencast before 8.1 and 7.6 allows unauthorized public access to all media and metadata by default via OAI-PMH. OAI-PMH is part of the default workflow and is activated by default, requiring active user intervention of users to protect media. This leads to users unknowingly handing out public access to events without their knowledge. The problem has been addressed in Opencast 7.6 and 8.1 where the OAI-PMH endpoint is configured to require users with `ROLE_ADMIN` by default. In addition to this, Opencast 9 removes the OAI-PMH publication from the default workflow, making the publication a conscious decision users have to make by updating their workflows.

Affected products

• opencast: before 7.6; 8.0 — fixed in 7.6

How to fix

Upgrade to a fixed version: opencast 7.6. Check the vendor advisory for mitigations.

References

• https://github.com/opencast/opencast/blob/1fb812c7810c78f09f29a7f455ff920417924307/etc/security/mh_default_org.xml#L271-L276
• https://github.com/opencast/opencast/security/advisories/GHSA-6f54-3qr9-pjgj
• https://github.com/opencast/opencast/blob/1fb812c7810c78f09f29a7f455ff920417924307/etc/security/mh_default_org.xml#L271-L276
• https://github.com/opencast/opencast/security/advisories/GHSA-6f54-3qr9-pjgj

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