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Confluence CVE-2026-21569

HIGH
Improper Restriction of XML External Entity Reference (CWE-611)
2026-01-28 security@atlassian.com
Atlassian Confluence XXE Crowd
7.9
CVSS 3.0 · NVD
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Severity by source

NVD PRIMARY
7.9 HIGH
AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 28, 2026 - 01:16 nvd
HIGH 7.9

DescriptionCVE.org

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.

AnalysisAI

XXE injection in Atlassian Crowd Data Center and Server 7.1.0+ enables authenticated attackers to read local and remote files, significantly compromising confidentiality and availability. The vulnerability requires high privileges to exploit but accepts no user interaction, affecting multiple Crowd versions until patching to 7.1.3 or later. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Crowd instance
Delivery
Submit crafted XML with external entity references
Exploit
Parse malicious XML input
Execution
Access local files or remote content
Impact
Exfiltrate sensitive data
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Vulnerability AssessmentAI

Exploitation Authenticated user account on Crowd Data Center/Server version 7.1.0 or later. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.9 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all Crowd instances running version 7.1.0 or later; assess network exposure and restrict access to affected systems. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-21569 vulnerability details – vuln.today
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