CVE-2023-37580KEV · OVERDUE

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

Medium · published July 31, 2023

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 6.1. It is confirmed in active exploitation. It sits in the 98.9th percentile for exploit probability.

1163
days past CISA
deadline
CVSS v3.1
6.1
EPSS
49%
Percentile
98.9
In the wild
Confirmed
What it is

⚠️ An unsuspecting user could be tricked into running malicious scripts with just a click in Zimbra Collaboration! 🚨 Think of this XSS flaw like a sneaky waiter who serves you a dish that looks perfectly fine, but is secretly laced with a surprise ingredient — only it's your browser that gets the spicy surprise instead! Once activated, an attacker could steal sensitive information, hijack user sessions, or redirect users to malicious sites, creating a chaotic situation that could compromise user trust and data security. It’s not catastrophic, but definitely something to pay attention to!

Put simply

Think of this XSS flaw like a sneaky waiter who serves you a dish that looks perfectly fine, but is secretly laced with a surprise ingredient — only it's your browser that gets the spicy surprise instead! This vulnerability exists in Zimbra Classic Web Client, where inadequate input validation allows attackers to execute cross-site scripting (XSS) attacks by injecting harmful scripts through user inputs. It affects versions prior to 8.8.15 Patch 41.

What to do

Once activated, an attacker could steal sensitive information, hijack user sessions, or redirect users to malicious sites, creating a chaotic situation that could compromise user trust and data security. It’s not catastrophic, but definitely something to pay attention to! To secure your system, update Zimbra Collaboration to version 8.8.15 Patch 41 or later. Additionally, ensure you implement proper input validation and sanitization to safeguard against future attacks. Don't wait—patch it today! You've got this! Fixing this flaw will enhance your security and keep your users safe! 🛡️

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.49083 · 98.9th percentile
Published
2023-07-31T00:00Z
KEV added
2023-07-27 · due 2023-08-17
EPSS history
Timeline
  • 31 JUL 00:00Z
    Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client
    cvelistv5
  • 27 JUL 00:00Z
    Added to CISA KEV — remediate by Aug 17
    kev