AI description
CVE-2024-27443 is a Cross-Site Scripting (XSS) vulnerability found in the CalendarInvite feature of the Zimbra Collaboration Suite (ZCS) classic webmail interface. This vulnerability exists because of improper input validation when handling the calendar header in email messages. An attacker can exploit this flaw by sending a specially crafted email containing a malicious calendar header with an embedded XSS payload. When a user views the email in the Zimbra classic web interface, the malicious code is executed within their browser, potentially allowing the attacker to compromise the user's session and execute arbitrary JavaScript code.
- 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.
- Source
- cve@mitre.org
- NVD status
- Analyzed
CVSS 3.1
- Type
- Primary
- Base score
- 6.1
- Impact score
- 2.7
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Severity
- MEDIUM
Data from CISA
- Vulnerability name
- Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
- Exploit added on
- May 19, 2025
- Exploit action due
- Jun 9, 2025
- 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.
- Hype score
- Not currently trending
Cross Site Scripting - Zimbra Collaboration (CVE-2024-27443) vulnerability. ESET discovered attacks in 2024 but only disclosed this on May 15, 2025. #Zimbra #ESET ➡️ https://t.co/gVBYIgAbNN https://t.co/qcyEsAYmDH
@leonov_av
3 Jun 2025
9 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
A critical XSS vulnerability, CVE-2024-27443, in Zimbra Collaboration Suite’s CalendarInvite feature is actively being exploited, potentially by the Sednit hacking group.https://t.co/dRyM5KgkmC
@blackwired32799
26 May 2025
26 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Zimbra CVE-2024-27443 XSS Flaw Hits 129K Servers, Sednit Suspected https://t.co/PbE91KXppy via @HackRead
@newsoft53759560
26 May 2025
1 Impression
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Zimbra CVE-2024-27443 XSS Flaw Hits 129K Servers, Sednit Suspected - Hackread https://t.co/Cud7ZEW3EV #AgenticAI
@EpicPlain
25 May 2025
44 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Zimbra CVE-2024-27443 XSS Flaw Hits 129K Servers, Sednit Suspected - Hackread https://t.co/Cud7ZEW3EV #CyberSecurity
@EpicPlain
25 May 2025
42 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Zimbra CVE-2024-27443 XSS Flaw Hits 129K Servers, Sednit Suspected https://t.co/yfTL4foXOg #ransomware #cybersecurityawareness #artificialintelligence #exploit #zerotrust #zeroday #infosecurity #threatintelligence
@Rajaaaaa07_
24 May 2025
3 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Zimbra CVE-2024-27443 XSS Flaw Hits 129K Servers, Sednit Suspected https://t.co/cLJU0NqP8k #infosec #security
@NotTruppi
24 May 2025
49 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Latest Known Exploited Vulnerabilities (#KEV) : #CVE-2024-27443 #Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability https://t.co/PZ8GOsOaGa
@ScyScan
22 May 2025
18 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
🚨 STRIKE Threat Intel Advisory – CVE-2024-27443 🚨 SecurityScorecard’s STRIKE team is tracking active exposure of CVE-2024-27443 — a medium-severity vulnerability currently being exploited in the wild and is found to be targeting government entities and defense comp
@security_score
20 May 2025
122 Impressions
1 Retweet
1 Like
0 Bookmarks
0 Replies
0 Quotes
Latest Known Exploited Vulnerabilities (#KEV) : #CVE-2024-27443 #Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability https://t.co/PZ8GOsOIvI
@ScyScan
20 May 2025
62 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
#APT28 Different XSS vulnerabilities being used to target additional webmail software: Horde, MDaemon, and Zimbra. Roundcube CVE-2020-35730 CVE-2023-43770 MDaemon CVE-2024-11182 Outlook Elevation of Privilege Vul CVE-2023-23397 Zimbra CVE-2024-27443 https://t.co/VX2gyK5WkH https:
@blackorbird
16 May 2025
3161 Impressions
22 Retweets
63 Likes
23 Bookmarks
0 Replies
0 Quotes
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