CVE-2025-27915

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Entry Details

CVE-2025-27915

Confirmed

Yes

2025-10-07 00:00 UTC

Timestamps

2025-10-07

2025-10-07

Scope

KEV entry: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability | Affected: Synacor / Zimbra Collaboration Suite (ZCS) | Description: Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that 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. | 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. | Due date: 2025-10-28 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-27915

References
  • {'id': 'CVE-2025-27915', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-27915'}

a138edd8-d085-4aeb-95f9-7f8a95f82f1c

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 13:24 UTC

2026-02-06 07:53 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-79"
  ],
  "date_added": "2025-10-07",
  "due_date": "2025-10-28",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Zimbra Collaboration Suite (ZCS)",
  "vendorProject": "Synacor",
  "vulnerabilityName": "Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability"
}
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