CVE-2025-66376 - Vulnerability Details - OpenCVE

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Vendors	Products
Zimbra	Collaboration

No data.

No data.

References

Link	Providers
https://wiki.zimbra.com/wiki/Security_Center
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

History

Tue, 06 Jan 2026 00:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mon, 05 Jan 2026 15:00:00 +0000

Type	Values Removed	Values Added
Description		Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.
First Time appeared		Zimbra Zimbra collaboration
Weaknesses		CWE-79
CPEs		cpe:2.3:a:zimbra:collaboration::::::::
Vendors & Products		Zimbra Zimbra collaboration
References		https://wiki.zimbra.com/wiki/Security_Center https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Metrics		cvssV3_1 `{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}`

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-01-05T00:00:00.000Z

Updated: 2026-01-05T20:42:49.837Z

Reserved: 2025-11-28T00:00:00.000Z

Link: CVE-2025-66376

Vulnrichment

Updated: 2026-01-05T20:42:37.847Z

NVD

Status : Received

Published: 2026-01-05T15:15:44.903

Modified: 2026-01-05T15:15:44.903

Link: CVE-2025-66376

Redhat

No data.

{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2025-66376", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-01-05T20:42:49.837Z", "dateReserved": "2025-11-28T00:00:00.000Z", "datePublished": "2026-01-05T00:00:00.000Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Collaboration", "vendor": "Zimbra", "versions": [{"lessThan": "10.0.18", "status": "affected", "version": "10.0", "versionType": "custom"}, {"lessThan": "10.1.13", "status": "affected", "version": "10.1", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-01-05T14:49:53.107Z"}, "references": [{"url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}, {"url": "https://wiki.zimbra.com/wiki/Security_Center"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes"}], "x_generator": {"engine": "enrichogram 0.0.1"}, "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.2, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"}}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0", "versionEndExcluding": "10.0.18"}, {"vulnerable": true, "criteria": "cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.1", "versionEndExcluding": "10.1.13"}]}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-05T20:41:21.735446Z", "id": "CVE-2025-66376", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-05T20:42:49.837Z"}}]}, "dataVersion": "5.2"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-66376", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-05T20:41:21.735446Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-05T20:42:37.847Z"}}], "cna": {"metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.2, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"}}], "affected": [{"vendor": "Zimbra", "product": "Collaboration", "versions": [{"status": "affected", "version": "10.0", "lessThan": "10.0.18", "versionType": "custom"}, {"status": "affected", "version": "10.1", "lessThan": "10.1.13", "versionType": "custom"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}, {"url": "https://wiki.zimbra.com/wiki/Security_Center"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes"}], "x_generator": {"engine": "enrichogram 0.0.1"}, "descriptions": [{"lang": "en", "value": "Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "10.0.18", "versionStartIncluding": "10.0"}, {"criteria": "cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "10.1.13", "versionStartIncluding": "10.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-01-05T14:49:53.107Z"}}}, "cveMetadata": {"cveId": "CVE-2025-66376", "state": "PUBLISHED", "dateUpdated": "2026-01-05T20:42:49.837Z", "dateReserved": "2025-11-28T00:00:00.000Z", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "datePublished": "2026-01-05T00:00:00.000Z", "assignerShortName": "mitre"}, "dataVersion": "5.2"}