Medium
Security advisory
An issue was discovered in ZmMailMsgView.js in the Calendar Invite component in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 23. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-35208
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:29 UTC · Revision 1
Source evidence
An issue was discovered in ZmMailMsgView.js in the Calendar Invite component in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 23. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
osv:CVE-2021-35208
Complete source record
{
"id": "d4c9ce808e7e0449cb95bbdc49c1d09399c40780c36bd2a03a8efb8e83a10e69",
"url": "https://osv.dev/vulnerability/CVE-2021-35208",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-35208",
"summary": "An issue was discovered in ZmMailMsgView.js in the Calendar Invite component in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 23. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.",
"evidence": "osv:CVE-2021-35208",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-35208",
"aliases": [
"CVE-2021-35208"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/zimbra/zm-build",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ac6081fa002b1511e926aba37740d2b6c20f3f43"
},
{
"introduced": "ac6081fa002b1511e926aba37740d2b6c20f3f43"
},
{
"last_affected": "0e40da921adb967639011de45841cef4c4601413"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8"
},
{
"fixed": "8.8.15"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:-:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-NA"
},
{
"last_affected": "8.8.15-NA"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-p1"
},
{
"last_affected": "8.8.15-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:p11:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-p11"
},
{
"last_affected": "8.8.15-p11"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:p20:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-p20"
},
{
"last_affected": "8.8.15-p20"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:p3:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-p3"
},
{
"last_affected": "8.8.15-p3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:zimbra:collaboration:8.8.15:p5:*:*:*:*:*:*",
"range": [
{
"introduced": "8.8.15-p5"
},
{
"last_affected": "8.8.15-p5"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"8.8.15-NA",
"8.8.15-p1",
"8.8.15-p20",
"8.8.15-p3",
"8.8.15-p5"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-35208.json"
}
}
],
"modified": "2026-10-24T10:30:54.086740489Z",
"provider": "osv",
"references": [
"https://wiki.zimbra.com/wiki/Security_Center",
"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23",
"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16",
"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories",
"https://blog.sonarsource.com/zimbra-webmail-compromise-via-email"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:zimbra:collaboration:8.8.15:p10:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p12:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p13:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p14:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p15:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p16:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p17:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p18:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p19:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p21:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p22:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p2:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p4:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p6:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p7:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p8:*:*:*:*:*:*",
"cpe:2.3:a:zimbra:collaboration:8.8.15:p9:*:*:*:*:*:*"
],
"vendor_product": "zimbra:collaboration",
"extracted_events": [
{
"range": [
{
"introduced": "8.8.15-p10"
},
{
"last_affected": "8.8.15-p10"
},
{
"introduced": "8.8.15-p12"
},
{
"last_affected": "8.8.15-p12"
},
{
"introduced": "8.8.15-p13"
},
{
"last_affected": "8.8.15-p13"
},
{
"introduced": "8.8.15-p14"
},
{
"last_affected": "8.8.15-p14"
},
{
"introduced": "8.8.15-p15"
},
{
"last_affected": "8.8.15-p15"
},
{
"introduced": "8.8.15-p16"
},
{
"last_affected": "8.8.15-p16"
},
{
"introduced": "8.8.15-p17"
},
{
"last_affected": "8.8.15-p17"
},
{
"introduced": "8.8.15-p18"
},
{
"last_affected": "8.8.15-p18"
},
{
"introduced": "8.8.15-p19"
},
{
"last_affected": "8.8.15-p19"
},
{
"introduced": "8.8.15-p2"
},
{
"last_affected": "8.8.15-p2"
},
{
"introduced": "8.8.15-p21"
},
{
"last_affected": "8.8.15-p21"
},
{
"introduced": "8.8.15-p22"
},
{
"last_affected": "8.8.15-p22"
},
{
"introduced": "8.8.15-p4"
},
{
"last_affected": "8.8.15-p4"
},
{
"introduced": "8.8.15-p6"
},
{
"last_affected": "8.8.15-p6"
},
{
"introduced": "8.8.15-p7"
},
{
"last_affected": "8.8.15-p7"
},
{
"introduced": "8.8.15-p8"
},
{
"last_affected": "8.8.15-p8"
},
{
"introduced": "8.8.15-p9"
},
{
"last_affected": "8.8.15-p9"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-35208",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438060,
"published_at": "2021-07-02T19:15:08.417+00:00"
}