What’s Vulnerable › Vulnerabilities
CVE-2026-93641: Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation
- Severity: critical (CVSS 9.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-25 · updated 2026-09-29
- Weakness: CWE-79
Description
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.
Affected products
- Zimbra Collaboration Suite (ZCS): before 10.1.21 — fixed in 10.1.21
How to fix
Upgrade to a fixed version: Zimbra Collaboration Suite (ZCS) 10.1.21. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-93641 or the next vulnerability affects your stack