CVE-2024-27443 KEV
6.1
MEDIUM · CVSS 3.1 · EPSS 23.6% (pctl 98)
Patch first
On CISA KEV — known exploited in the wild, due 2025-06-09.
Description
An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context of the victim's session, potentially leading to execution of arbitrary JavaScript code.
Scoring
| CVSS | 6.1 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| EPSS | 23.63% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-79 |
| On CISA KEV | yes — remediate by 2025-06-09 |
| Public exploit | none known |
| Published | 2024-08-12 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability |
|---|---|
| Added | 2025-05-19 |
| Due | 2025-06-09 |
| Vendor / product | Synacor / Zimbra Collaboration Suite (ZCS) |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| zimbra | collaboration |
References
→ the Explorer · watch your stack · NVD