CVE-2026-21569
7.9 · HIGHOverview
CVE-2026-21569 is a high-severity vulnerability affecting atlassian crowd. It was published on January 28, 2026 and has a CVSS 3.0 base score of 7.9 (HIGH).
This vulnerability has a CVSS 3.0 base score of 7.9, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
This High severity XXE (XML External Entity Injection) vulnerability was introduced in version 7.1.0 of Crowd Data Center and Server.
This XXE (XML External Entity Injection) vulnerability, with a CVSS Score of 7.9, allows an authenticated attacker to access local and remote content which has high impact to confidentiality, low impact to integrity, high impact to availability, and requires no user interaction.
Atlassian recommends that Crowd Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
* Crowd Data Center and Server 7.1: Upgrade to a release greater than or equal to 7.1.3
See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center and Server from the download center (https://www.atlassian.com/software/crowd/download-archive).
This vulnerability was reporte
Remediation
Check the references section for vendor advisories and patches from atlassian. Update crowd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| atlassian | crowd | >= 7.1.0, < 7.1.3 | Affected |
Frequently Asked Questions
What is CVE-2026-21569?
CVE-2026-21569 is a high-severity vulnerability affecting atlassian crowd. It was published on January 28, 2026 and has a CVSS 3.0 base score of 7.9 (HIGH).
How severe is CVE-2026-21569?
This vulnerability has a CVSS 3.0 base score of 7.9, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-21569?
Check the references section for vendor advisories and patches from atlassian. Update crowd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-21569?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21569 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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