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Vulnerabilities

Vulnerability · CVE-2023-37580

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Published Jun 29, 2023 · catalog updated Jun 16, 2026 · Synacor Zimbra Collaboration Suite (ZCS)

Patch now

CVE-2023-37580 is in the CISA known-exploited catalog, due Aug 17, 2023. 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
49.08%
Remediation
Remediation guidance
Affected products
cpe synacor/zimbra collaboration suite · vendor Synacor Zimbra Collaboration Suite (ZCS)

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

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 Collaboration Suite (ZCS)version unspecified

How to fix CVE-2023-37580

What to do

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

Should you patch?

CVE-2023-37580 is in the CISA known-exploited catalog, due Aug 17, 2023. 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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 49.08%. 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. Jul 27, 2023 · Catalog

    Detected

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

  2. Jul 27, 2023 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  3. Aug 17, 2023 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  4. Jun 16, 2026 · Catalog

    Updated

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-37580

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-37580

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-37580

    30-day exploitation probability 49.1%

    first.org
  • NIST NVDVulnerability recordCVE-2023-37580

    Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2023-37580

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

    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.