CVE-2024-27443
Synacor Zimbra Collaboration Suite (ZCS) Cross-Sit - [Actively Exploited]
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.
INFO
Published Date :
Aug. 12, 2024, 3:15 p.m.
Last Modified :
May 21, 2025, 6:43 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.7
Exploitability Score :
2.8
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes ; https://nvd.nist.gov/vuln/detail/CVE-2024-27443
Public PoC/Exploit Available at Github
CVE-2024-27443 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-27443.
| URL | Resource |
|---|---|
| https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes | Release Notes |
| https://www.welivesecurity.com/en/eset-research/operation-roundpress/ | Press/Media Coverage |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-27443 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-27443 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
May. 21, 2025
Action Type Old Value New Value Added Reference Type CISA-ADP: https://www.welivesecurity.com/en/eset-research/operation-roundpress/ Types: Press/Media Coverage -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
May. 20, 2025
Action Type Old Value New Value Added Date Added 2025-05-19 Added Due Date 2025-06-09 Added 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. Added Vulnerability Name Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 19, 2025
Action Type Old Value New Value Added Reference https://www.welivesecurity.com/en/eset-research/operation-roundpress/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 17, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 -
Reanalysis by [email protected]
Aug. 14, 2024
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:10.0.0:*:*:*:*:*:*:* OR *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:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:* versions from (including) 10.0.0 up to (excluding) 10.0.7 -
Initial Analysis by [email protected]
Aug. 13, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Changed Reference Type https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes No Types Assigned https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes Release Notes Changed Reference Type https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes No Types Assigned https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes Release Notes Added CWE NIST CWE-79 Added CPE Configuration OR *cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:* *cpe:2.3:a:zimbra:collaboration:10.0.0:*:*:*:*:*:*:* -
CVE Received by [email protected]
Aug. 12, 2024
Action Type Old Value New Value Added 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. Added Reference MITRE https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes [No types assigned] Added Reference MITRE https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-27443 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-27443
weaknesses.