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TI-2026-63078 Aliases CVE-2026-93641GHSA-q6cg-4x8w-53j7

Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation

Priority MEDIUM 42CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Classic recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00273 19th percentileScored 2026-11-07
Fix Fixed Zimbra Collaboration Suite (ZCS) (Zimbra): 10.1.21

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZimbraZimbra Collaboration Suite (ZCS)before 10.1.2110.1.21Patch availableCNA
  • Zimbra Collaboration Suite (ZCS) VendorZimbra Affected before 10.1.21 Fixed in 10.1.21 Patch available CNA

Remediation

  • Fix · CNA Zimbra Collaboration Suite (ZCS) (Zimbra) Fixed in 10.1.21

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Zimbra Collaboration Suite (ZCS) 10.1.21

    4 records Highest priority Priority MEDIUM 4 MEDIUM

    Other records, highest priority first

    • TI-2026-63080 Path traversal in Zimbra Collaboration SuitePriority MEDIUM 51
    • TI-2026-63081 Cross-site scripting in Zimbra Collaboration SuitePriority MEDIUM 41
    • TI-2026-63079 Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share InvitationPriority MEDIUM 41
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93641
  2. 2026-10-03 Alias added: GHSA-q6cg-4x8w-53j7

References

Advisory 1

  • TI-2026-51660 OS command injection in Zimbra Collaboration KEVCVSS 3.1HIGH 8.9
  • TI-2025-40820 Cross-site scripting in Zimbra Collaboration KEVCVSS 3.1HIGH 7.2
  • TI-2024-18266 An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. KEVCVSS 3.1MEDIUM 6.1
  • TI-2024-30553 An issue was discovered in Zimbra Collaboration (ZCS) 10.1.x before 10.1.1, 10.0.x before… CVSS 3.1HIGH 8.8
  • TI-2022-13998 Zimbra Collaboration Open Source 8.8.15 does not encrypt the initial-login randomly… CVSS 3.1CRITICAL 9.8
  • TI-2026-63080 Path traversal in Zimbra Collaboration Suite CVSS 3.1CRITICAL 9.8
See all 94 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences