What’s Vulnerable › Vulnerabilities

CVE-2020-26234: Disabled Hostname Verification in OpenCast

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-08 · updated 2026-06-17
• Weakness: CWE-346

Description

Opencast before versions 8.9 and 7.9 disables HTTPS hostname verification of its HTTP client used for a large portion of Opencast's HTTP requests. Hostname verification is an important part when using HTTPS to ensure that the presented certificate is valid for the host. Disabling it can allow for man-in-the-middle attacks. This problem is fixed in Opencast 7.9 and Opencast 8.8 Please be aware that fixing the problem means that Opencast will not simply accept any self-signed certificates any longer without properly importing them. If you need those, please make sure to import them into the Java key store. Better yet, get a valid certificate.

Affected products

• opencast: before 7.9; from 8.0 before 8.9 — fixed in 7.9, 8.9

How to fix

Upgrade to a fixed version: opencast 7.9, 8.9. Check the vendor advisory for mitigations.

References

• https://github.com/opencast/opencast/commit/4225bf90af74557deaf8fb6b80b0705c9621acfc
• https://github.com/opencast/opencast/security/advisories/GHSA-44cw-p2hm-gpf6
• https://github.com/opencast/opencast/commit/4225bf90af74557deaf8fb6b80b0705c9621acfc
• https://github.com/opencast/opencast/security/advisories/GHSA-44cw-p2hm-gpf6

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