Critical

CISA orders feds to patch Zimbra XSS flaw exploited in attacks

BleepingComputer

March 18, 2026 at 7:57 PM

Actively Exploited

Overview

The Cybersecurity and Infrastructure Security Agency (CISA) has directed U.S. federal agencies to address a vulnerability in the Zimbra Collaboration Suite (ZCS) that is currently being exploited in the wild. This flaw allows for cross-site scripting attacks, which can enable attackers to execute malicious scripts in the context of a user's session. Affected organizations need to act quickly to secure their servers to prevent unauthorized access and data breaches. The urgency of this directive underscores the importance of maintaining up-to-date security practices, especially for government entities that handle sensitive information. Users of ZCS should ensure their systems are patched as soon as possible to mitigate the risk posed by this vulnerability.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Zimbra Collaboration Suite (ZCS)
Action Required: CISA has recommended that organizations immediately apply available security patches for the Zimbra Collaboration Suite to mitigate the risk of exploitation.
Timeline: Newly disclosed

Original Article Summary

CISA has ordered U.S. government agencies to secure their servers against an actively exploited vulnerability in the Zimbra Collaboration Suite (ZCS). [...]

Impact

Zimbra Collaboration Suite (ZCS)

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

CISA has recommended that organizations immediately apply available security patches for the Zimbra Collaboration Suite to mitigate the risk of exploitation. Specific patch numbers or versions were not mentioned in the article, so organizations should refer to Zimbra's official resources for the latest updates.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability, Patch, XSS.

Read Original Article

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