Medium
Security advisory
An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0. To exploit the vulnerability, an attacker would need to have obtained a valid zimbra auth token or a valid preauth token. Once the token is obtained, an attacker could redirect a user to any URL via isredirect=1&redirectURL= in conjunction with the token data (e.g., a valid authtoken= value).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-34807
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:10 UTC · Revision 1
Source evidence
An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0. To exploit the vulnerability, an attacker would need to have obtained a valid zimbra auth token or a valid preauth token. Once the token is obtained, an attacker could redirect a user to any URL via isredirect=1&redirectURL= in conjunction with the token data (e.g., a valid authtoken= value).
osv:CVE-2021-34807
Complete source record
{
"id": "fade6cc98bd7640f977a60fec817fa590f573fc1232d53fe007fc20e580fcc69",
"url": "https://osv.dev/vulnerability/CVE-2021-34807",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-34807",
"summary": "An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0. To exploit the vulnerability, an attacker would need to have obtained a valid zimbra auth token or a valid preauth token. Once the token is obtained, an attacker could redirect a user to any URL via isredirect=1&redirectURL= in conjunction with the token data (e.g., a valid authtoken= value).",
"evidence": "osv:CVE-2021-34807",
"products": [],
"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
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"type": "GIT",
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{
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"versions": [
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"8.8.9",
"8.8.8",
"8.7.11",
"8.8.7",
"8.8.6",
"8.8.4",
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"8.8.0.beta1",
"8.7.10",
"8.7.9",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-34807.json"
}
}
],
"modified": "2026-10-24T10:31:03.859160388Z",
"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"
],
"provider_metadata": {
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"cpe:2.3:a:zimbra:collaboration:8.8.15:p19:*:*:*:*:*:*",
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},
"related_cves": [
{
"value": "CVE-2021-34807",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440368,
"published_at": "2021-07-02T19:15:08.33+00:00"
}