Vulnerability details
CVE-2026-93642
Zimbra Collaboration Suite
Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share Invitation
CVSS 3.1
9.3Critical
Official description
An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Modern recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 3.1 | CVEProject cvelistV5 (CNA) (rapid7) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite (ZCS) | v < 10.1.21 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories vendor-advisory
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Details
- Published
- 2026-09-25
- Last updated
- 2026-09-25
- State
- Published
- Assigner (CNA)
- rapid7
Exploit prediction (EPSS)
0.22%
Probability of exploitation in 30 days
13.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-79Improper neutralization of input during web page generation ('cross-site scripting')