What is CVE-2026-21569?

CVE-2026-21569 is a high-severity vulnerability in Atlassian Crowd, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.9/10. Published 2026-01-28.

How severe is CVE-2026-21569?

High severity. CVSS v3 base score is 7.9 out of 10.

XXE in Atlassian Crowd

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. This XXE (XML External Entity Injection) vulnerability, with a CVSS Score of 7.9, allows an authentic…

Vulnerability class: XXE (XML External Entity)

EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.9 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H.

Affected products

Atlassian Crowd
Atlassian Crowd Data Center — versions 7.1.0 to 7.1.2, 7.1.3

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

security@atlassian.com (Vendor Advisory)
security@atlassian.com (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21569?: CVE-2026-21569 is a high-severity vulnerability in Atlassian Crowd, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.9/10. Published 2026-01-28.
How severe is CVE-2026-21569?: High severity. CVSS v3 base score is 7.9 out of 10.