CVE-2023-34192

Critical9.0Published on July 6, 2023

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.

Actively exploited

In the CISA exploited-vulnerabilities catalogue since Feb 25, 2025
US federal agencies must remediate it by Mar 18, 2025 (BOD 22-01)
First attack observed 599 days after disclosure

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Source: CISA KEV · Jan 20, 2026 Dec 11, 2025 Feb 25, 2025

CVSS score9.0 / 10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Weakness type (CWE)CWE-79, CWE-79

Vendorssynacor