Critical 9.0Known exploited (CISA KEV)Published Jul 6, 2023

CVE-2023-34192Cross 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.

Updated under an hour ago (2026-10-19 10:10 UTC)

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It affects synacor zimbra_collaboration_suite. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Feb 25, 2025; federal agencies had to remediate by Mar 18, 2025. Treat that date as your deadline.

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Exploited in the last 30 days

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: 9.0 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-79
Known exploited: Added to CISA KEV Feb 25, 2025; federal remediation due Mar 18, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 77.27% (percentile 100)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

synacor zimbra_collaboration_suite synacor:zimbra_collaboration_suite	8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; and 33 more ranges	NVD

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesvendor-advisory
https://wiki.zimbra.com/wiki/Security_Centerrelease-notes, vendor-advisory
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policynot-applicable
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34192us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.