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CISA KEV · Known exploitedCritical

CVE-2023-22515

Atlassian Confluence Data Center and Server

Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have exploited a previously unknown vulnerability in publicly accessible Confluence Data Center and Server instances to create unauthorized Confluence administrator accounts and access Confluence instances. Atlassian Cloud sites are not affected by this vulnerability. If your Confluence site is accessed via an atlassian.net domain, it is hosted by Atlassian and is not vulnerable to this issue.

CVSS
9.8
EPSS
99.2%
99.9% percentile
CISA KEV
Listed
Published
2023.10.04
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability99.2%
Technical severityCVSS 9.8

Vulnerability overview

Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have exploited a previously unknown vulnerability in publicly accessible Confluence Data Center and Server instances to create unauthorized Confluence administrator accounts and access Confluence instances. Atlassian Cloud sites are not affected by this vulnerability. If your Confluence site is accessed via an atlassian.net domain, it is hosted by Atlassian and is not vulnerable to this issue.

Affected product and versions

Product
Atlassian Confluence Data Center and Server
Affected versions
>= 8.0.0, >= 8.0.1, >= 8.0.2, >= 8.0.3, >= 8.1.3, >= 8.1.4, >= 8.2.0, >= 8.2.1, >= 8.2.2, >= 8.2.3, >= 8.3.0, >= 8.3.1, >= 8.3.2, >= 8.4.0, >= 8.4.1, >= 8.4.2, >= 8.5.0, >= 8.5.1, >= 8.0.0 < 8.3.3, >= 8.4.0 < 8.4.3
Fixed versions
8.3.3, 8.4.3, 8.5.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check all affected Confluence instances for evidence of compromise per vendor instructions and report any positive findings to CISA.

Due date: 2023.10.13
  1. 1
    Identify

    Confirm that Atlassian Confluence Data Center and Server and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20
KEV added
2023.10.05
Ransomware use
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