CVE-2023-34192KEV · OVERDUE

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

Critical · published July 6, 2023

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.0. It is confirmed in active exploitation. It sits in the 99.6th percentile for exploit probability.

584
days past CISA
deadline
CVSS v3.1
9.0
EPSS
77%
Percentile
99.6
In the wild
Confirmed
What it is

🚨 A simple crafted script is all it takes for an attacker to unleash chaos in Zimbra ZCS v.8.8.15! 🔥 Think of it like a sneaky chef slipping a toxic ingredient into your favorite dish while you're not looking — one bite can be absolutely devastating! This Cross Site Scripting (XSS) vulnerability allows a remote authenticated attacker to execute arbitrary code, potentially compromising sensitive user data and gaining full control over the impacted application. Users could be exposed to malicious activities, data theft, or even unauthorized access to accounts — a recipe for disaster!

Put simply

Think of it like a sneaky chef slipping a toxic ingredient into your favorite dish while you're not looking — one bite can be absolutely devastating! The vulnerability exists in the /h/autoSaveDraft function of Zimbra ZCS, where inadequate input validation permits the execution of arbitrary scripts from an authenticated user, opening the door to exploitation.

What to do

This Cross Site Scripting (XSS) vulnerability allows a remote authenticated attacker to execute arbitrary code, potentially compromising sensitive user data and gaining full control over the impacted application. Users could be exposed to malicious activities, data theft, or even unauthorized access to accounts — a recipe for disaster! Immediately patch to version 8.8.16 or later to close this security gap. Review user access permissions, and implement stronger input validation measures to safeguard against such exploits. Don't wait — secure your application now! You've got this! Follow these steps and become a security hero in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.77266 · 99.6th percentile
Published
2023-07-06T00:00Z
KEV added
2025-02-25 · due 2025-03-18
EPSS history
Timeline
  • 25 FEB 00:00Z
    Added to CISA KEV — remediate by Mar 18
    kev
  • 06 JUL 00:00Z
    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…
    cvelistv5