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CVE-2024-27443

MEDIUM · CVSS 6.1 · Analyzed

Published: 2024-08-12 · Updated: 2026-06-17 · Source: NVD

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Vulnerability overview

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 and scoring

CVSS score
6.1 · MEDIUM
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-79

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Listed in CISA’s Known Exploited Vulnerabilities catalog.

Affected product
Synacor · Zimbra Collaboration Suite (ZCS)
Added to catalog
2025-05-19
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA remediation due date
2025-06-09

CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*

    From (inclusive): 10.0.0

    Before (exclusive): 10.0.7

  • cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p0:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p1:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p10:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p11:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p12:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p13:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p14:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p15:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p16:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p19:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p2:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p20:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p21:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p23:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p24:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p24.1:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p25:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p26:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p27:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p3:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p30:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p31:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p32:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p33:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p34:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p35:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p36:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p37:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p38:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p4:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p5:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p6:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p7:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p7.1:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p8:*:*:*:*:*:*

  • cpe:2.3:a:zimbra:collaboration:9.0.0:p9:*:*:*:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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