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Home > Cybersecurity > Zero-day XSS vulnerability found in Zimbra

Zero-day XSS vulnerability found in Zimbra

Volexity announced that they have discovered a series of attacks using exploiting a zero-day cross-site scripting vulnerability in Zimbra.


Erdem Yasar Erdem Yasar
February 5, 2022
2 min read
Zero-day XSS vulnerability found in Zimbra

Volexity announced that they detected attackers trying to exploit a zero-day cross-site scripting vulnerability in Zimbra, an open-source email platform popular among organizations. Volexity detected a series of targeted spear-phishing campaigns, through its Network Security Monitoring service, targeting one of its customers from a threat actor it tracks as TEMP_Heretic. 

Two attack phases

The campaigns use multiple waves in two attack phases. The first phase targets reconnaissance and involved emails designed to simply track if a target opens the message. The second phase includes several waves that contain email messages that try to trick the user to click an attacker-crafted link. If the target visits the link while it was logged into the Zimbra webmail client, the attack becomes successful.

When successfully exploited, the vulnerability allows an attacker to run arbitrary JavaScript in the context of the user’s Zimbra session. Volexity stated that attackers are attempting to load JavaScript to steal user mail data and attachments. The vulnerability is allowing an attacker to other actions in the context of the user’s Zimbra webmail session, such as:

  • Exfiltrate cookies to allow persistent access to a mailbox.
  • Send further phishing messages to a user’s contacts.
  • Present a prompt to download malware in the context of a trusted website.

Currently, there is no available patch nor an assigned CVE for the vulnerability. Volexity recommends:

  • All of the indicators here should be blocked at the mail gateway and network level.
  • Users of Zimbra should analyze historical referrer data for suspicious access and referrers. The default location for these logs can be found at /opt/zimbra/log/access*.log.
  • Users of Zimbra should consider upgrading to version 9.0.0, as there is currently no secure version of 8.8.15.

See more Cybersecurity News


Tags: VolexityVulnerabilityZimbra Email Server
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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