Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2022-04-19. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2018-6882
MediumCVSS 6.1KEVExploitation Probability (EPSS)
Very high risk98th percentile - higher than 98% of all known CVEs
Summary
A cross-site scripting (XSS) vulnerability in ZmMailMsgView.getAttachmentLinkHtml in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7. Remote attackers can inject arbitrary web script or HTML via a Content-Location header in an email attachment.
Risk Assessment
An attacker could exploit XSS to steal user sessions, take over accounts, or spread malware within the Zimbra environment.
Recommendation
Update Zimbra Collaboration Suite to version 8.7 Patch 1 or later (for 8.7) and 8.8.7 or later (for 8.8.x).
Other vulnerabilities in Zimbra Collaboration Suite
See all- CVE-2022-37042CriticalActively exploited
Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.
- CVE-2022-27925HighActively exploited
Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. An authenticated user with administrator rights has the ability to upload arbitrary files to the system, leading to directory traversal.
- CVE-2022-24682MediumActively exploited
The Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 allows an attacker to place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
- CVE-2019-9621HighActively exploited
An SSRF vulnerability in the ProxyServlet component of Zimbra Collaboration Suite. It allows an attacker to send requests from the server to internal resources.
Original NVD description (English source)
Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS