TL;DR

['CISA has added a new cross-site scripting vulnerability affecting Synacor Zimbra Collaboration Suite to their KEV catalog. This highlights the urgency in addressing such vulnerabilities to protect against cyber threats.']

What happened

['CISA has included CVE-2025-66376, a Cross-Site Scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite, in its Known Exploited Vulnerabilities Catalog based on evidence of exploitation.']

Why it matters for ops

['Operators need to monitor and remediate this known exploited vulnerability due to the significant risk it poses to systems within federal agencies and beyond.']

Mitigation

  • Apply security patches provided by Synacor to mitigate the XSS vulnerability.

Action items

  • Update affected systems and monitor for any unusual activity related to this vulnerability.

Detection IOCs

  • Evidence of Cross-Site Scripting attempts on Synacor Zimbra platforms

Source link

https://www.cisa.gov/news-events/alerts/2026/03/18/cisa-adds-one-known-exploited-vulnerability-catalog