CVE-2020-26234

Name: CVE-2020-26234
Creator: NVD / NIST
Published: 2020-12-08T23:15:12.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2020-26234 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

0.28%

19.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apereo	Opencast	< 7.9
Apereo	Opencast	>= 8.0, < 8.9

References

https://github.com/opencast/opencast/commit/4225bf90af74557deaf8fb6b80b0705c9621acfcPatch, Third Party Advisory
https://github.com/opencast/opencast/security/advisories/GHSA-44cw-p2hm-gpf6Third Party Advisory
https://github.com/opencast/opencast/commit/4225bf90af74557deaf8fb6b80b0705c9621acfcPatch, Third Party Advisory
https://github.com/opencast/opencast/security/advisories/GHSA-44cw-p2hm-gpf6Third Party Advisory

Timeline

Published: Dec 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26234?

How severe is CVE-2020-26234?

CVE-2020-26234 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26234?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26234?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST