Zimbra Collaboration - Cross-Site Scripting (XSS)

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 v...

Zimbra Collaboration (ZCS) - Cross Site Scripting

A reflected cross-site scripting XSS vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration aka ZCS 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters. id: CVE-2022-27926 info: name: Zimbra Collaboration ZCS - Cross Site...

Zimbra Collaboration Suite (ZCS) v.8.8.15 - Cross-Site Scripting

Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function. id: CVE-2023-34192 info: name: Zimbra Collaboration Suite ZCS v.8.8.15 - Cross-Site Scripting author: ritikchaddha...

Zimbra Collaboration Suite < 8.8.15 - Improper Encoding

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 update 1, as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing...

Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

Zimbra Collaboration Suite ZCS contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user...

Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution

A now-patched security flaw impacting Zimbra Collaboration ZCS has come under active exploitation in the wild, according to the Polish Computer Emergency Response Team CERT Polska. The vulnerability in question is CVE-2026-73570 CVSS score: 8.9, which refers to a case of command injection that ca...

Zimbra Collaboration Suite - Memcached Command Injection

Zimbra Collaboration Suite versions 8.8.15 and 9.0 contain a memcached command injection vulnerability that allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance, leading to cache poisoning and potential credential theft. id: CVE-2022-27924 info: name:...

Zimbra Collaboration Suite - SSRF

Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component. id: CVE-2019-9621 info: name: Zimbra Collaboration Suite - SSRF author: riteshs4hu severity: high description: |...

VulnCheck KEV: CVE-2026-73570

A remote code execution vulnerability exists in Zimbra Collaboration ZCS before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send...

CVE-2026-73573

In Zimbra Collaboration ZCS before 10.1.17, a path traversal vulnerability exists in the Zimbra Briefcase document editing functionality due to improper validation of the packages parameter. An authenticated attacker can exploit this vulnerability by supplying a crafted path traversal sequence,...

CVE-2026-73576

In Zimbra Collaboration ZCS before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with...

CVE-2026-73575

In Zimbra Collaboration ZCS before 10.1.17, a Cross-Site Request Forgery CSRF vulnerability exists in the Exchange Web Services EWS endpoint of Zimbra Collaboration ZCS due to insufficient validation of request content types. An attacker can exploit this vulnerability by causing an authenticated...

CVE-2026-73574

In Zimbra Collaboration before 10.1.17, a local file inclusion LFI vulnerability exists in the Zimbra Classic Web Client due to improper validation of the fu request parameter. An unauthenticated attacker can exploit this vulnerability by supplying a crafted path, potentially allowing unauthorize...

CVE-2026-73570

A remote code execution vulnerability exists in Zimbra Collaboration ZCS before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send...

CVE-2026-73571

An authorization bypass vulnerability exists in Zimbra Collaboration ZCS before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without...

CVE-2026-73576

CVE-2026-73576 affects Zimbra Collaboration (ZCS) before 10.1.17 via the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated with an insecure RNG, yielding insufficient entropy. This may allow offline brute-forcing to recover the JWT signing secret, enabling JWT forgery and po...

EUVD-2026-58075

In Zimbra Collaboration ZCS before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with...

CVE-2026-73576

In Zimbra Collaboration ZCS before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with...

CVE-2026-73576

In Zimbra Collaboration ZCS before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with...

CVE-2026-73575

In Zimbra Collaboration ZCS before 10.1.17, a Cross-Site Request Forgery CSRF vulnerability exists in the Exchange Web Services EWS endpoint of Zimbra Collaboration ZCS due to insufficient validation of request content types. An attacker can exploit this vulnerability by causing an authenticated...