Improper validation of certificate with host mismatch in Opencast - CVE-2020-26234
Published: December 8, 2020 / Updated: April 23, 2026
Vulnerability identifier: #VU127011
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-26234
CWE-ID: CWE-297
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to conduct man-in-the-middle attacks.
The vulnerability exists due to improper certificate validation in the HTTP client when handling HTTPS requests. A remote attacker can present a certificate with a mismatched hostname to conduct man-in-the-middle attacks.
Affected software
Opencast
How to mitigate CVE-2020-26234
Install security update from vendor's website.
Opencast - addressed in versions 7.9, 8.9