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CVE-2023-34192

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

9.0 CRITICALActively exploited (CISA KEV)EPSS 77.3%
  1. Published6 Jul 2023
  2. Added to CISA KEV25 Feb 2025
  3. Remediation due18 Mar 2025
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.

Added to KEV: 25 Feb 2025Federal remediation due: 18 Mar 2025

Description

Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Synacor Zimbra Collaboration Suite8.8.15

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2023-34192 being actively exploited?

Yes. CVE-2023-34192 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Feb 2025.

How severe is CVE-2023-34192?

CVE-2023-34192 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 77.3% probability of exploitation.

Which products are affected by CVE-2023-34192?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2023-34192?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-34192 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.