High
Security advisory
Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. A user can upload executable files (exe,sh,bat,jar) in the Contact section of the mailbox as an avatar image for a contact. A user will receive a "Corrupt File" error, but the file is still uploaded and stored locally in /opt/zimbra/data/tmp/upload/, leaving it open to possible remote execution.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-12846
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:26 UTC · Revision 1
Source evidence
Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. A user can upload executable files (exe,sh,bat,jar) in the Contact section of the mailbox as an avatar image for a contact. A user will receive a "Corrupt File" error, but the file is still uploaded and stored locally in /opt/zimbra/data/tmp/upload/, leaving it open to possible remote execution.
osv:CVE-2020-12846
Complete source record
{
"id": "29e4357134006068d06abc616d602a0227250db5946d752a8493bc36e4f58c06",
"url": "https://osv.dev/vulnerability/CVE-2020-12846",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-12846",
"summary": "Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. A user can upload executable files (exe,sh,bat,jar) in the Contact section of the mailbox as an avatar image for a contact. A user will receive a \"Corrupt File\" error, but the file is still uploaded and stored locally in /opt/zimbra/data/tmp/upload/, leaving it open to possible remote execution.",
"evidence": "osv:CVE-2020-12846",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-12846",
"aliases": [
"CVE-2020-12846"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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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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},
{
"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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],
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},
{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p7:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p8:*:*:*:*:*:*",
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{
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],
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{
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"versions": [
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],
"database_specific": {
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"vanir_signatures": [
{
"id": "CVE-2020-12846-4314dc38",
"digest": {
"length": 461,
"function_hash": "130804680382483964301386928646396783356"
},
"source": "https://github.com/zimbra/zm-mailbox/commit/d30e647f21ecef5490f21facf2e06e228b44a36e",
"target": {
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"function": "updateLastLogon"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
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{
"id": "CVE-2020-12846-96c6e311",
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"source": "https://github.com/zimbra/zm-mailbox/commit/d30e647f21ecef5490f21facf2e06e228b44a36e",
"target": {
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},
"deprecated": false,
"signature_type": "Line",
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}
],
"vanir_signatures_modified": "2026-10-24T14:22:37Z"
}
},
{
"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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}
}
],
"modified": "2026-10-24T14:22:37.464582351Z",
"provider": "osv",
"references": [
"https://wiki.zimbra.com/wiki/Security_Center",
"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3",
"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"
],
"provider_metadata": {
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{
"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:*:*:*:*:*:*",
"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p7:*:*:*:*:*:*",
"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p8:*:*:*:*:*:*",
"cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p9:*:*:*:*:*:*",
"cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p1:*:*:*:*:*:*",
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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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{
"last_affected": "8.8.15-p4"
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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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{
"last_affected": "8.8.15-p6"
},
{
"introduced": "8.8.15-p7"
},
{
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{
"introduced": "8.8.15-p7"
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{
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{
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{
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{
"introduced": "8.8.15-p8"
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{
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{
"introduced": "8.8.15-p8"
},
{
"last_affected": "8.8.15-p8"
},
{
"introduced": "8.8.15-p8"
},
{
"last_affected": "8.8.15-p8"
},
{
"introduced": "8.8.15-p9"
},
{
"last_affected": "8.8.15-p9"
},
{
"introduced": "8.8.15-p9"
},
{
"last_affected": "8.8.15-p9"
},
{
"introduced": "8.8.15-p9"
},
{
"last_affected": "8.8.15-p9"
},
{
"introduced": "9.0.0-p1"
},
{
"last_affected": "9.0.0-p1"
},
{
"introduced": "9.0.0-p1"
},
{
"last_affected": "9.0.0-p1"
},
{
"introduced": "9.0.0-p2"
},
{
"last_affected": "9.0.0-p2"
},
{
"introduced": "9.0.0-p2"
},
{
"last_affected": "9.0.0-p2"
},
{
"introduced": "9.0.0-p2"
},
{
"last_affected": "9.0.0-p2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-12846",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443672,
"published_at": "2020-06-03T17:15:24.793+00:00"
}