Critical
Security advisory
An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3311
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:55 UTC · Revision 1
Source evidence
An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.
osv:CVE-2021-3311
Complete source record
{
"id": "9413e0ac027766b6de0ca02a956fb9de31c912024bba732929c66be32735f50d",
"url": "https://osv.dev/vulnerability/CVE-2021-3311",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3311",
"summary": "An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.",
"evidence": "osv:CVE-2021-3311",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2021-3311",
"aliases": [
"CVE-2021-3311",
"GHSA-7ggw-h8pp-r95r"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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{
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"type": "GIT",
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{
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"database_specific": {
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}
},
{
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"source": "CPE_RANGE"
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],
"modified": "2026-10-24T10:50:41.748924368Z",
"provider": "osv",
"references": [
"https://octobercms.com/forum/chan/announcements",
"https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024",
"https://anisiosantos.me/october-cms-token-reactivation"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-3311",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442486,
"published_at": "2021-02-05T14:15:19.153+00:00"
}