CVE-2020-5222: Hard-Coded Key Used For Remember-me Token in OpenCast

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% 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-798

Description

Opencast before 7.6 and 8.1 enables a remember-me cookie based on a hash created from the username, password, and an additional system key. This means that an attacker getting access to a remember-me token for one server can get access to all servers which allow log-in using the same credentials without ever needing the credentials. This problem is fixed in Opencast 7.6 and Opencast 8.1

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/commit/1a7172c95af8d542a77ae5b153e4c834dd4788a6
https://github.com/opencast/opencast/security/advisories/GHSA-mh8g-hprg-8363
https://github.com/opencast/opencast/commit/1a7172c95af8d542a77ae5b153e4c834dd4788a6
https://github.com/opencast/opencast/security/advisories/GHSA-mh8g-hprg-8363

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