Authentication Bypass by Spoofing in Opencast - CVE-2021-43807
Published: December 14, 2021 / Updated: April 23, 2026
Vulnerability identifier: #VU127009
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-43807
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apereo Foundation
Affected software:
Opencast
Opencast
Detailed vulnerability description
The vulnerability allows a remote user to bypass request method restrictions and perform unauthorized state-changing actions.
The vulnerability exists due to authentication bypass by spoofing in the HTTP method handling logic when processing requests with a URL parameter that overrides the HTTP method. A remote user can craft a link or form that changes the assumed HTTP method to bypass request restrictions and perform unauthorized state-changing actions.
User interaction is required, such as an authenticated administrator clicking a crafted link or submitting a crafted form.
How to mitigate CVE-2021-43807
Install security update from vendor's website.