CVE-2025-27915

MEDIUM CISA KEV EPSS 89.8%
Published Mar 12, 20251y ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Mar 12, 2025 1y ago
Last Modified Jun 17, 2026 2w ago
KEV Listed Oct 7, 2025 8mo ago
KEV Due Oct 28, 2025 246d overdue

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 <details> 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.

CVSS Details

Base Score
5.4
Exploitability
2.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

CISA Known Exploited Overdue 246d
Added
Oct 7, 2025
Due
Oct 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.

EPSS Exploit Probability
89.8% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 47

VendorProductVersionRange
synacorzimbra_collaboration_suite*≥10.0.0  –  <10.0.13
synacorzimbra_collaboration_suite*≥10.1.0  –  <10.1.5
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
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synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any
synacorzimbra_collaboration_suite9.0.0any

References 6

  • strikeready.com https://strikeready.com/blog/0day-ics-attack-in-the-wild/
    ExploitThird Party Advisory
  • wiki.zimbra.com https://wiki.zimbra.com/wiki/Security_Center
    Release Notes
  • wiki.zimbra.com https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.13#Security_Fixes
    Release Notes
  • wiki.zimbra.com https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes
    Release Notes
  • wiki.zimbra.com https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes
    Release Notes
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27915
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.