CVE-2026-21569

This High severity XXE (XML External Entity Injection) vulnerability was introduced in version 7.1.0 of Crowd Data Center and Server

High · published January 28, 2026

CVSS v3.0
7.9
EPSS
0%
Percentile
25.5
In the wild
Unconfirmed
What it is

🚨 An authenticated attacker can pull back the curtains on your local and remote files! This sneaky XXE vulnerability in Crowd Data Center and Server has a CVSS Score of 7.9, and it's making waves since version 7.1.0! 🔥 Think of it like a magician who can read the minds of audience members, revealing secrets they never intended to share. In this case, the attacker exploits XML parsing to access sensitive files without needing any input from the victim. This vulnerability could lead to serious breaches of confidentiality, allowing unauthorized access to potentially sensitive information. The attacker could exposure internal files or even engage in denial-of-service attacks, leaving your systems struggling to cope. It's a high-stakes game, and your valuable data is on the line!

Put simply

Think of it like a magician who can read the minds of audience members, revealing secrets they never intended to share. In this case, the attacker exploits XML parsing to access sensitive files without needing any input from the victim. This XXE vulnerability allows attackers to include external entity references in an XML input, which can be used to access arbitrary files on the server or potentially cause a denial of service due to resource exhaustion. It requires no user interaction and can be triggered simply by sending crafted XML data.

What to do

This vulnerability could lead to serious breaches of confidentiality, allowing unauthorized access to potentially sensitive information. The attacker could exposure internal files or even engage in denial-of-service attacks, leaving your systems struggling to cope. It's a high-stakes game, and your valuable data is on the line! To protect yourself, upgrade your Crowd Data Center and Server to the latest version immediately. If that's not feasible, at least upgrade to a version greater than or equal to 7.1.3 as a temporary fix. Check the Atlassian release notes to ensure you're up-to-date! You've got this! By taking these steps, you can safeguard your data and maintain your security hero status! 🛡️

The record
Technical detail
CVSS v3.0
7.9 · HIGH
Vector
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00334 · 25.5th percentile
Published
2026-01-28T00:30Z
EPSS history
Timeline
  • 28 JAN 00:30Z
    This High severity XXE (XML External Entity Injection) vulnerability was introduced in version 7.1.0 of Crowd Data Center and Server
    cvelistv5