Zimbra Zero-Day: The ICS File Fiasco Leaving Cybersecurity in a Tangle
CISA’s new catalog addition: Synacor Zimbra’s flaw, CVE-2025-27915. This XSS vulnerability allows attackers to hijack sessions and exfiltrate data through sneaky ICS files, making your calendar appointments more hazardous than your in-laws’ holiday visits. Fix it by October 28, 2025, or risk becoming a cyber punchline!
Hot Take:
Well folks, it seems the Zimbra Collaboration Suite is now in a committed relationship with CISA’s Known Exploited Vulnerabilities catalog. Who knew a mail suite could have such a scandalous love life? With its XSS flaw, Zimbra’s going viral for all the wrong reasons. Let’s hope this breakup with the bug world happens before October 28th, because nobody wants to deal with a clingy vulnerability!
Key Points:
- Zimbra’s flaw, CVE-2025-27915, added to CISA’s Known Exploited Vulnerabilities catalog.
- Flaw involves a stored XSS vulnerability from improper HTML sanitization in ICS files.
- Zero-day attacks leveraged malicious iCalendar (.ICS) files to execute JavaScript payloads.
- StrikeReady discovered attacks, linking TTPs to Belarusian APT group UNC1151.
- CISA mandates federal agencies to resolve the vulnerabilities by October 28, 2025.
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