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cve recordhighexploited in the wild3 of 3 cataloguesexploit reported

CVE-2025-66376

Synacor · Zimbra Collaboration Suite (ZCS) · Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS20.2%97.5th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueApr 1, 2026
patch window

Called exploited 71 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing2mo
  3. Last KEV listing1d
  4. Last sighting5mo

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by1 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

9 public reports collected from VulnCheck and CIRCL, first on Mar 17, 2026. Each links to its original source. We have not verified them.

Description

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

← Back to the CVE Tracker

Our coverage of CVE-2025-66376

CVE-2026-73570critical

Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution

Attackers are reportedly exploiting a critical vulnerability in Zimbra Collaboration Suite (ZCS) that enables unauthenticated remote code execution. The flaw, tracked as CVE-2026-73570 and assigned a CVSS score of 8.9, is attributed to insufficient input sanitization within the Simple Network Management Protocol (SNMP) notification processing component of ZCS.

CVE-2008-4128high

July 2026 CVE Landscape

Cybersecurity researchers identified 85 high-impact vulnerabilities in July 2026 that require urgent remediation, marking a 44% increase from the previous month. Of these, 36 were assigned a "Very Critical" risk score by Insikt Group. The vulnerabilities affected products from 61 vendors, with Microsoft accounting for approximately 12% of the total.

CVE-2025-66376high

Russian Espionage Group Exploited Zimbra Zero-Day to Steal Mail and 2FA Codes

A Russian espionage group has reportedly exploited a zero-day vulnerability in the Zimbra Collaboration webmail client to steal sensitive user data, including emails and two-factor authentication codes. The campaign, attributed to the group TA488 (also known as LAUNDRY BEAR or Void Blizzard), began as early as July 2025 and continued for several months until the vulnerability was patched in…