{"id":"CVE-2020-5206","aliases":["GHSA-vmm6-w4cf-7f3x"],"url":"https://o3.security/vulnerability/CVE-2020-5206","summary":"Authentication Bypass For Endpoints With Anonymous Access in Opencast","details":"### Impact\n\nUsing a remember-me cookie with an arbitrary username can cause Opencast to assume proper authentication for that user even if the remember-me cookie was incorrect given that the attacked endpoint also allows anonymous access.\n\nThis way, an attacker can, for example, fake a remember-me token, assume the identity of the global system administrator and request non-public content from the search service without ever providing any proper authentication.\n\n\n### Patches\n\nThis problem is fixed in Opencast 7.6 and Opencast 8.1\n\n\n### Workarounds\n\nAs a workaround for older, unpatched versions, disabling remember-me cookies in `etc/security/mh_default_org.xml` will mitigate the problem but will obviously also disable this feature without obvious indication. To deactivate this, remove the following line from the security configuration:\n\n```xml\n<sec:remember-me … />\n```\n\n### References\n\n- [Remember-me cookie in the security configuration file](https://github.com/opencast/opencast/blob/161ee619382f144dc35eea211fc6b556025b98e1/etc/security/mh_default_org.xml#L335-L336)\n\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n- Open an issue in [opencast/opencast](https://github.com/opencast/opencast/issues)\n- For security-relevant information, email us at security@opencast.org","published":"2020-01-30T22:15:10.093Z","modified":"2026-07-09T01:07:53.588737Z","cvss":{"score":10,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.opencastproject:opencast-kernel","fixedVersion":"7.6"},{"ecosystem":"Maven","name":"org.opencastproject:opencast-kernel","fixedVersion":"8.1"}],"fix":{"url":"https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8","label":"opencast/opencast@b157e1f"},"references":[{"type":"ADVISORY","url":"https://github.com/opencast/opencast/security/advisories/GHSA-vmm6-w4cf-7f3x"},{"type":"FIX","url":"https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5206"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:07:53.588737Z"}}