CVE-2025-27915Vulnerability
Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on .
Reported by 1 independent source · first reported by Rapid7 · last reported
Last reported 30 days ago
CISA KEVAdded 7 Oct 2025
Fix due 28 Oct 2025
Used by ransomware: not knownCISA KEV catalogue
Fix due 28 Oct 2025
Used by ransomware: not knownCISA KEV catalogue
EPSS4.1%
higher than 90% of CVEsFIRST EPSS, as of 23 Oct 2026
higher than 90% of CVEsFIRST EPSS, as of 23 Oct 2026
What the reports say
1 report, newest first · the exact sentence from each-
When Business Email Compromise Starts Rewriting Reality“CVE-2025-27915, stored XSS in the Classic Web Client, triggered by a crafted .ICS attachment.”
Indicators reported together
named in the same reportsAlso named with it: CVE-2026-73570, CVE-2022-27925, CVE-2024-45519, CVE-2022-37042, CVE-2023-37580
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