CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVE-2024-27443
Medium (6.1) in Synacor Zimbra Collaboration Suite (ZCS). In CISA KEV since 2025-05-19. EPSS 25% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 25% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)
- CISA KEV
- listed 2025-05-19, due 2025-06-09
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- zimbra:collaboration