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

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• cpe synacor/zimbra collaboration suite8.8.15
• vendor Synacor Zimbra Collaborate Suite (ZCS)version unspecified
• vendor Synacor Zimbra Collaboration Suite (ZCS)version unspecified

How to fix CVE-2022-24682

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Mar 11, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Feb 8, 2022 · Catalog

   Detected

   An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

2. Feb 25, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Mar 11, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Aug 6, 2026 · Catalog

   Updated

   An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

Sources

• CISA KEVConfirmed exploitationCVE-2022-24682

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2022-24682

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2022-24682

  30-day exploitation probability 30.9%

  first.org
• NIST NVDVulnerability recordCVE-2022-24682

  An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2022-24682

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

  vulncheck.com

References

• VulnCheck exploitation evidence · assets.sentinelone.com
• Vendor Advisory · blog.zimbra.com
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · docs.google.com
• CISA note · nvd.nist.gov
• Vendor Advisory · wiki.zimbra.com
• Release Notes · wiki.zimbra.com
• Vendor Advisory · wiki.zimbra.com
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cve.org

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.