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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...

Basic Information

CVE State
PUBLISHED
Reserved Date
February 26, 2024
Published Date
August 12, 2024
Last Updated
May 21, 2025
Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
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.
Tags
cisa

CVSS Scores

CVSS v3.1

6.1 - MEDIUM

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

EPSS Score

Score
27.05% (Percentile: 96.10%) as of 2025-06-14

SSVC Information

Exploitation
active
Technical Impact
total

Exploit Status

Exploited in the Wild
Yes (2025-05-19 17:45:31 UTC) Source

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

Known Exploited Vulnerability Information

Source Added Date
CISA 2025-05-19 17:45:24 UTC

Recent Mentions

CISA Adds Six Known Exploited Vulnerabilities to Catalog

Source: All CISA Advisories • Published: 2025-05-19 12:00:00 UTC

CISA has added six new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation.  CVE-2025-4427 Ivanti Endpoint Manager Mobile (EPMM) Authentication Bypass Vulnerability CVE-2025-4428 Ivanti Endpoint Manager Mobile (EPMM) Code Injection Vulnerability CVE-2024-11182 MDaemon Email Server Cross-Site Scripting (XSS) Vulnerability CVE-2025-27920 Srimax Output Messenger Directory Traversal Vulnerability CVE-2024-27443 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability CVE-2023-38950 ZKTeco BioTime Path Traversal Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.  Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the Known Exploited Vulnerabilities Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information.  Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel