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    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 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 reported via our Atlassian (Internal) program.

    Published:Jan 28, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 28, 2026
    EPSS Score:0.00021
    CVSS Score:7.9

    Affected Products

    Vendor
    Atlassian
    Product
    Crowd
    Vendor
    Atlassian
    Product
    Crowd Data Center

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

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    CVE-2022-26137 (CVSS 8.8) — A vulnerability in multiple Atlassian products allows a remote, unauthenticated attacker to cause additional S…
    CVE-2022-26136 (CVSS 9.8) — A vulnerability in multiple Atlassian products allows a remote, unauthenticated attacker to bypass Servlet Fil…
    CVE-2020-36240 (CVSS 5.3) — The ResourceDownloadRewriteRule class in Crowd before version 4.0.4, and from version 4.1.0 before 4.1.2 allow…
    CVE-2019-20902 (CVSS 7.5) — Upgrading Crowd via XML Data Transfer can reactivate a disabled user from OpenLDAP. The affected versions are …
    CVE-2019-20104 (CVSS 7.5) — The OpenID client application in Atlassian Crowd before version 3.6.2, and from version 3.7.0 before 3.7.1 all…
    CVE-2017-18107 (CVSS 6.5) — Various resources in the Crowd Demo application of Atlassian Crowd before version 3.1.1 allow remote attackers…
    CVE-2019-15005 (CVSS 4.3) — The Atlassian Troubleshooting and Support Tools plugin prior to version 1.17.2 allows an unprivileged user to …
    CVE-2019-11580 (CVSS 9.8) — Atlassian Crowd and Crowd Data Center had the pdkinstall development plugin incorrectly enabled in release bui…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High