CVE-2024-27443

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

Threats tracking this CVE

• APT28/UAC-0001 Sustained Cyber Espionage Against Ukraine & EU (2024-2026 New TTPs) — HIGH

References

• https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes
• https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27443
• https://www.welivesecurity.com/en/eset-research/operation-roundpress/

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