NVD - CVE-2025-27915 (original) (raw)
CVE-2025-27915 Detail
Description
An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a
tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.
Metrics
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CVSS 4.0 Severity and Vector Strings:
NIST: NVD
N/A
NVD assessment not yet provided.
CVSS 3.x Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
ADP: CISA-ADP
Base Score: 5.4 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0 Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://strikeready.com/blog/0day-ics-attack-in-the-wild/ | CISA-ADP | Exploit Third Party Advisory |
| https://wiki.zimbra.com/wiki/Security_Center | MITRE | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.13#Security_Fixes | MITRE | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes | MITRE | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes | MITRE | Release Notes |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27915 | CISA-ADP | US Government Resource |
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name | Date Added | Due Date | Required Action |
|---|---|---|---|
| Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability | 10/07/2025 | 10/28/2025 | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CISA-ADP |
Known Affected Software Configurations Switch to CPE 2.2
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Change History
12 change records found show changes
CVE Modified by CISA-ADP 6/17/2026 5:04:22 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | SSVC | {"timestamp":"2025-10-07T03:55:56.855156Z","id":"CVE-2025-27915","options":[{"exploitation":"active"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"} |
CVE Modified by MITRE 6/17/2026 5:04:22 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Affected | [{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}] |
Modified Analysis by NIST 11/04/2025 11:45:11 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CPE Configuration | Record truncated, showing 2048 of 3765 characters. View Entire Change Record OR *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:-:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p1:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p2:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p10:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p11:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p12:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p13:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p14:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p15:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p16:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p17:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p18:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p19:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p20:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p21:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p22:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p23:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p3:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p24:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p24.1:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p25:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p26:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p27:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p28:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p29:*:*:*:*:*:* *cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p30:*:*:*:*:*:* *cpe:2.3: | |
| Removed | CPE Configuration | Record truncated, showing 2048 of 3043 characters. View Entire Change Record OR *cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p2:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p3:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p4:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p5:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p6:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p9:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p0:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p1:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p10:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p11:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p12:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p13:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p14:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p15:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p19:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p7:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p8:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p16:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p20:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p21:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p23:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p24:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p24.1:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p25:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p26:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p27:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p28:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p29:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p30:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p31:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p32:*:*:*:*:*:* | |
| Added | Reference Type | CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field\_cve=CVE-2025-27915 Types: US Government Resource |
CVE Modified by CISA-ADP 10/21/2025 7:16:54 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Reference | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field\_cve=CVE-2025-27915 |
CVE Modified by CISA-ADP 10/21/2025 4:20:32 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Removed | Reference | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field\_cve=CVE-2025-27915 |
CVE Modified by CISA-ADP 10/21/2025 3:21:13 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Reference | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field\_cve=CVE-2025-27915 |
Modified Analysis by NIST 10/08/2025 8:48:18 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Reference Type | CISA-ADP: https://strikeready.com/blog/0day-ics-attack-in-the-wild/ Types: Exploit, Third Party Advisory |
CVE CISA KEV Update by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 10/07/2025 9:00:02 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Date Added | 2025-10-07 | |
| Added | Due Date | 2025-10-28 | |
| Added | Required Action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | |
| Added | Vulnerability Name | Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability |
CVE Modified by CISA-ADP 10/07/2025 2:15:58 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Reference | https://strikeready.com/blog/0day-ics-attack-in-the-wild/ |
Initial Analysis by NIST 4/02/2025 4:38:25 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CPE Configuration | Record truncated, showing 2048 of 3042 characters. View Entire Change Record OR *cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p2:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p3:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p4:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p5:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p6:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p9:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p0:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p1:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p10:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p11:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p12:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p13:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p14:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p15:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p19:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p7:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p8:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p16:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p20:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p21:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p23:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p24:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p24.1:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p25:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p26:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p27:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p28:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p29:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p30:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p31:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:9.0.0:p32:*:*:*:*:*:* | |
| Added | Reference Type | MITRE: https://wiki.zimbra.com/wiki/Security\_Center Types: Release Notes | |
| Added | Reference Type | MITRE: https://wiki.zimbra.com/wiki/Zimbra\_Releases/10.0.13#Security\_Fixes Types: Release Notes | |
| Added | Reference Type | MITRE: https://wiki.zimbra.com/wiki/Zimbra\_Releases/10.1.5#Security\_Fixes Types: Release Notes | |
| Added | Reference Type | MITRE: https://wiki.zimbra.com/wiki/Zimbra\_Releases/9.0.0/P44#Security\_Fixes Types: Release Notes |
CVE Modified by CISA-ADP 3/12/2025 12:15:24 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CVSS V3.1 | AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | |
| Added | CWE | CWE-79 |
New CVE Received from MITRE 3/12/2025 11:15:39 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Description | An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration. |
|
| Added | Reference | https://wiki.zimbra.com/wiki/Security\_Center | |
| Added | Reference | https://wiki.zimbra.com/wiki/Zimbra\_Releases/10.0.13#Security\_Fixes | |
| Added | Reference | https://wiki.zimbra.com/wiki/Zimbra\_Releases/10.1.5#Security\_Fixes | |
| Added | Reference | https://wiki.zimbra.com/wiki/Zimbra\_Releases/9.0.0/P44#Security\_Fixes |
Quick Info
CVE Dictionary Entry:
CVE-2025-27915
NVD Published Date:
03/12/2025
NVD Last Modified:
06/17/2026
Source:
MITRE