Security advisory
A cross-site scripting (XSS) vulnerability in Web Client in Zimbra 9.0 allows a remote attacker to craft links in an E-Mail message or calendar invite to execute arbitrary JavaScript. The attack requires an A element containing an href attribute with a "www" substring (including the quotes) followed immediately by a DOM event listener such as onmouseover. This is fixed in 9.0.0 Patch 2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-11737
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:53 UTC · Revision 1
Source evidence
A cross-site scripting (XSS) vulnerability in Web Client in Zimbra 9.0 allows a remote attacker to craft links in an E-Mail message or calendar invite to execute arbitrary JavaScript. The attack requires an A element containing an href attribute with a "www" substring (including the quotes) followed immediately by a DOM event listener such as onmouseover. This is fixed in 9.0.0 Patch 2.
osv:CVE-2020-11737
Complete source record
{
"id": "3671629a150ae0c7962d463c806ebbb7cd98d4955488108d3f47602a2d58224b",
"url": "https://osv.dev/vulnerability/CVE-2020-11737",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-11737",
"summary": "A cross-site scripting (XSS) vulnerability in Web Client in Zimbra 9.0 allows a remote attacker to craft links in an E-Mail message or calendar invite to execute arbitrary JavaScript. The attack requires an A element containing an href attribute with a \"www\" substring (including the quotes) followed immediately by a DOM event listener such as onmouseover. This is fixed in 9.0.0 Patch 2.",
"evidence": "osv:CVE-2020-11737",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-11737",
"aliases": [
"CVE-2020-11737"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/zimbra/zm-build",
"type": "GIT",
"events": [
{
"introduced": "b6cd8f69d2761c014d4a3807f0bdee0011386444"
},
{
"last_affected": "b6cd8f69d2761c014d4a3807f0bdee0011386444"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:zimbra:zimbra:9.0.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"last_affected": "9.0.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"9.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11737.json"
}
}
],
"modified": "2026-10-24T10:30:46.072186281Z",
"provider": "osv",
"references": [
"https://blog.zimbra.com/2020/05/new-zimbra-9-kepler-patch-2/",
"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P2",
"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-11737",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 436256,
"published_at": "2020-05-05T15:15:12.28+00:00"
}