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Vulnerabilities

Vulnerability · CVE-2022-24682

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

Published Dec 16, 2021 · catalog updated Aug 6, 2026 · Synacor Zimbra Collaboration Suite (ZCS)

Patch now

CVE-2022-24682 is in the CISA known-exploited catalog, due Mar 11, 2022. Confirm Synacor Zimbra Collaboration Suite (ZCS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
30.93%
Remediation
Remediation guidance
Affected products
cpe synacor/zimbra collaboration suite · vendor Synacor Zimbra Collaborate Suite (ZCS) · vendor Synacor Zimbra Collaboration Suite (ZCS)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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

What to do

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

Should you patch?

CVE-2022-24682 is in the CISA known-exploited catalog, due Mar 11, 2022. Confirm Synacor Zimbra Collaboration Suite (ZCS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with synacor/zimbra collaboration suite 8.8.15. Apply updates per vendor instructions.

What should an analyst verify?

CWE-116; CWE-79: Cross-site Scripting (XSS). EPSS 30.93%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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

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.