Critical
Security advisory
In Opencast before 7.6 and 8.1, using 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. This 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. This problem is fixed in Opencast 7.6 and Opencast 8.1
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-5206
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:41 UTC · Revision 1
Source evidence
In Opencast before 7.6 and 8.1, using 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. This 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. This problem is fixed in Opencast 7.6 and Opencast 8.1
osv:CVE-2020-5206
Complete source record
{
"id": "eb57f5bb6c9f8164d0ec97cebc467c91468a02ab086ffa5ec331a12d526f5981",
"url": "https://osv.dev/vulnerability/CVE-2020-5206",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-5206",
"summary": "In Opencast before 7.6 and 8.1, using 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. This 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. This problem is fixed in Opencast 7.6 and Opencast 8.1",
"evidence": "osv:CVE-2020-5206",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2020-5206",
"aliases": [
"CVE-2020-5206",
"GHSA-vmm6-w4cf-7f3x"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/opencast/opencast",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6241ba154a6b364fea1928e52f8bf2a432934dc8"
},
{
"introduced": "5bb6a93a43a7f7c47f789e46e4018c80b8c54c8b"
},
{
"last_affected": "5bb6a93a43a7f7c47f789e46e4018c80b8c54c8b"
},
{
"fixed": "b157e1fb3b35991ca7bf59f0730329fbe7ce82e8"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "7.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:apereo:opencast:8.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "b157e1fb3b35991ca7bf59f0730329fbe7ce82e8"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-5206.json",
"vanir_signatures": [
{
"id": "CVE-2020-5206-512cd126",
"digest": {
"length": 1295,
"function_hash": "167346135946564669046519915409421511479"
},
"source": "https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8",
"target": {
"file": "modules/kernel/src/main/java/org/opencastproject/kernel/security/SecurityServiceSpringImpl.java",
"function": "getUser"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-5206-cb4ea6e9",
"digest": {
"threshold": 0.9,
"line_hashes": [
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},
"source": "https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8",
"target": {
"file": "modules/kernel/src/main/java/org/opencastproject/kernel/security/SecurityServiceSpringImpl.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:14:06Z"
}
}
],
"modified": "2026-10-20T14:14:06.243192188Z",
"provider": "osv",
"references": [
"https://github.com/opencast/opencast/security/advisories/GHSA-vmm6-w4cf-7f3x",
"https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-5206",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388741,
"published_at": "2020-01-30T22:15:10.093+00:00"
}