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Known exploited vulnerability · CISA KEV

CVE-2022-24682: Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the Calendar feature that allows an attacker to execute arbitrary code.

CVE-2022-24682

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2022-02-25: attackers are using it right now. It is known to be used in ransomware campaigns.

CISA KEV
Listed
Added 2022-02-25 · federal fix-by 2022-03-11
EPSS (30 days)
31%
Higher than 98% of CVEs · 2026-11-01
CVSS
No score

What CISA says

Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Apply updates per vendor instructions.

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How to check if you are exposed to CVE-2022-24682

  1. Find every Synacor Zimbra Collaborate Suite (ZCS) system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2022-24682.

US federal agencies had to fix this by 2022-03-11. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

  1. · Added to CISA's Known Exploited Vulnerabilities catalog
  2. · Fix-by date for US federal agencies, passed 1,696 days ago

Weakness type

More exploited Synacor vulnerabilities

CISA lists 19 exploited Synacor vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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