Medium
Security advisory
An issue was discovered in Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7. When grantors revoked a shared calendar in Outlook, the calendar stayed mounted and accessible.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-8633
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:26 UTC · Revision 1
Source evidence
An issue was discovered in Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7. When grantors revoked a shared calendar in Outlook, the calendar stayed mounted and accessible.
osv:CVE-2020-8633
Complete source record
{
"id": "1cf4493467bd4f40d9f83f4c7256260aacaf8a32391af49ea7234a573461f6bf",
"url": "https://osv.dev/vulnerability/CVE-2020-8633",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-8633",
"summary": "An issue was discovered in Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7. When grantors revoked a shared calendar in Outlook, the calendar stayed mounted and accessible.",
"evidence": "osv:CVE-2020-8633",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-8633",
"aliases": [
"CVE-2020-8633"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
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"type": "GIT",
"events": [
{
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},
{
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},
{
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}
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},
{
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],
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{
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{
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],
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},
{
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{
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},
{
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]
}
}
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"versions": [
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}
},
{
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{
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{
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{
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{
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},
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],
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},
{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*",
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{
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},
{
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}
],
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},
{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p4:*:*:*:*:*:*",
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p5:*:*:*:*:*:*",
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},
{
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],
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},
{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p6:*:*:*:*:*:*",
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},
{
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}
],
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}
]
}
}
],
"versions": [
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"8.8.15-p1",
"8.8.15-p2",
"8.8.15-p3",
"8.8.15-p4",
"8.8.15-p5",
"8.8.15-p6",
"8.8.8",
"8.8.12",
"8.8.10",
"8.8.9",
"8.8.7",
"8.8.6",
"8.8.5",
"8.8.4",
"8.8.3",
"8.8.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8633.json",
"vanir_signatures": [
{
"id": "CVE-2020-8633-4314dc38",
"digest": {
"length": 461,
"function_hash": "130804680382483964301386928646396783356"
},
"source": "https://github.com/zimbra/zm-mailbox/commit/d30e647f21ecef5490f21facf2e06e228b44a36e",
"target": {
"file": "store/src/java/com/zimbra/cs/account/ldap/LdapProvisioning.java",
"function": "updateLastLogon"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-8633-96c6e311",
"digest": {
"threshold": 0.9,
"line_hashes": [
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"249110717571679374632676844697594286961",
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]
},
"source": "https://github.com/zimbra/zm-mailbox/commit/d30e647f21ecef5490f21facf2e06e228b44a36e",
"target": {
"file": "store/src/java/com/zimbra/cs/account/ldap/LdapProvisioning.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:24:39Z"
}
},
{
"ranges": [
{
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},
{
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},
{
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{
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],
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},
{
"fixed": "8.8.15"
}
],
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},
{
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{
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{
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},
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}
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]
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}
],
"versions": [
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"8.8.11",
"8.8.10",
"8.8.9",
"8.8.8",
"8.7.11",
"8.8.7",
"8.8.6",
"8.8.5",
"8.8.4",
"8.8.3",
"8.8.2",
"8.8.0beta2",
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"8.7.10",
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"8.7.7",
"8.7.6"
],
"database_specific": {
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}
},
{
"ranges": [
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{
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{
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{
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{
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{
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{
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{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*",
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],
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{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p5:*:*:*:*:*:*",
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],
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],
"versions": [
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}
}
],
"modified": "2026-10-24T14:24:39.269571660Z",
"provider": "osv",
"references": [
"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*",
"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p4:*:*:*:*:*:*",
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"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p6:*:*:*:*:*:*"
],
"vendor_product": "synacor:zimbra_collaboration_suite",
"extracted_events": [
{
"range": [
{
"introduced": "8.8.15-p1"
},
{
"last_affected": "8.8.15-p1"
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{
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},
{
"last_affected": "8.8.15-p1"
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{
"introduced": "8.8.15-p2"
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{
"last_affected": "8.8.15-p2"
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{
"introduced": "8.8.15-p2"
},
{
"last_affected": "8.8.15-p2"
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{
"introduced": "8.8.15-p2"
},
{
"last_affected": "8.8.15-p2"
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{
"introduced": "8.8.15-p3"
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{
"last_affected": "8.8.15-p3"
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{
"introduced": "8.8.15-p4"
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{
"last_affected": "8.8.15-p4"
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{
"introduced": "8.8.15-p4"
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{
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{
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{
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},
{
"introduced": "8.8.15-p5"
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{
"last_affected": "8.8.15-p5"
},
{
"introduced": "8.8.15-p6"
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{
"last_affected": "8.8.15-p6"
},
{
"introduced": "8.8.15-p6"
},
{
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}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-8633",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443716,
"published_at": "2020-02-18T22:15:10.09+00:00"
}