Pierluigi Paganini
July 21, 2026
Zimbra patched nine flaws in version 10.1.20, including a critical SNMP monitoring command injection issue enabling arbitrary command execution. Zimbra released version 10.1.20 to fix nine security vulnerabilities, including a critical command injection flaw in the SNMP monitoring component. The vulnerability affects systems with SNMP notifications enabled and could allow attackers to execute arbitrary commands. […]
Pierluigi Paganini
July 10, 2026
Zimbra addressed a critical stored XSS vulnerability in its Classic Web Client that lets malicious emails execute code when opened. Zimbra has released version 10.1.19 to fix a critical stored XSS vulnerability in its Classic Web Client, which is widely used to access Zimbra Collaboration. The flaw, which has not yet received a CVE ID, […]
Pierluigi Paganini
March 19, 2026
Russian APT exploits a critical XSS flaw in Zimbra, tracked as CVE-2025-66376, running scripts via HTML emails to target users in Ukraine. Russia-linked threat actor exploits a high-severity XSS vulnerability, tracked as CVE-2025-66376 (CVSS score of 7.2), in Zimbra Collaboration. Attackers exploited insufficiently sanitized HTML emails to run scripts when opened, targeting users in Ukraine. […]
Pierluigi Paganini
October 07, 2025
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Synacor Zimbra Collaboration Suite (ZCS) flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Synacor Zimbra Collaboration Suite (ZCS) flaw, tracked as CVE-2025-27915, to its Known Exploited Vulnerabilities (KEV) catalog. CVE-2025-27915 is a stored XSS flaw in Zimbra Collaboration Suite (versions 9.0–10.1) […]
Pierluigi Paganini
October 06, 2025
Threat actors exploited a Zimbra zero-day via malicious iCalendar (.ICS) files used to deliver attacks through calendar attachments. StrikeReady researchers discovered that threat actors exploited the vulnerability CVE-2025-27915 in Zimbra Collaboration Suite in zero-day attacks using malicious iCalendar (.ICS) files. These files, used to share calendar data, were weaponized to deliver JavaScript payloads to targeted […]
Pierluigi Paganini
November 16, 2023
Google TAG revealed that threat actors exploited a Zimbra Collaboration Suite zero-day (CVE-2023-37580) to steal emails from governments. Google Threat Analysis Group (TAG) researchers revealed that a zero-day vulnerability, tracked as CVE-2023-37580 (CVSS score: 6.1), in the Zimbra Collaboration email software was exploited by four different threat actors to steal email data, user credentials, and authentication tokens […]
Pierluigi Paganini
August 18, 2023
A massive social engineering campaign is targeting users of the Zimbra Collaboration email server to steal their login credentials. ESET researchers uncovered a mass-spreading phishing campaign targeting users of the Zimbra Collaboration email server since April 2023. Zimbra Collaboration is an open-core collaborative software platform. The campaign is still ongoing and is targeting a wide range of […]
Pierluigi Paganini
July 13, 2023
Zimbra has released updates to address a zero-day vulnerability actively exploited in attacks aimed at Zimbra Collaboration Suite (ZCS) email servers. Zimbra urges customers to manually install updates to fix a zero-day vulnerability that is actively exploited in attacks against Zimbra Collaboration Suite (ZCS) email servers. Zimbra Collaboration Suite is a comprehensive open-source messaging and […]
Pierluigi Paganini
March 31, 2023
Russian hacking group Winter Vivern has been actively exploiting Zimbra flaws to steal the emails of NATO and diplomats. A Russian hacking group, tracked as Winter Vivern (aka TA473), has been actively exploiting vulnerabilities (CVE-2022-27926) in unpatched Zimbra instances to gain access to the emails of NATO officials, governments, military personnel, and diplomats. The CVE-2022-27926 […]
Pierluigi Paganini
October 16, 2022
Threat actors have compromised hundreds of servers exploiting critical flaw CVE-2022-41352 in Zimbra Collaboration Suite (ZCS). Last week, researchers from Rapid7 warned of the exploitation of unpatched zero-day remote code execution vulnerability, tracked as CVE-2022-41352, in the Zimbra Collaboration Suite. Rapid7 has published technical details, including a proof-of-concept (PoC) code and indicators of compromise (IoCs) regarding […]
