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Type:
Public Security Vulnerability
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Resolution: Fixed
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Priority:
Highest
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Affects Version/s: 9.1.0, 8.9.7, 9.1.1, 8.9.8, 9.2.0, 9.2.1, 9.4.0, 9.3.1, 9.2.2, 9.3.2, 9.2.3, 9.4.1, 9.2.4, 9.2.5, 9.2.6, 9.5.1, 9.5.2, 9.5.3, 9.2.7, 10.1.0, 9.2.8, 10.0.2, 10.0.3, 9.5.4, 9.2.9, 10.1.1, 10.2.0, 9.2.10, 10.1.2, 9.2.11, 9.2.12, 10.2.1, 9.2.13, 10.2.2, 9.2.14, 10.2.3, 9.2.15, 10.2.6, 9.2.17, 10.2.7, 9.2.19, 10.2.10, 10.2.11, 9.2.20, 9.2.21, 10.2.13, 10.2.14, 9.2.22
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Component/s: None
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9.1
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Critical
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CVE-2026-53434
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Atlassian (Internal)
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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MITM (Man-in-the-Middle)
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Confluence Data Center
This is a vulnerability in a non-Atlassian Confluence dependency. Atlassian's application of this dependency presents a lower, non-critical assessed risk.
This High severity MITM (Man-in-the-Middle) vulnerability was introduced in versions 8.9.7, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, 10.2.0 of Confluence Data Center.
This MITM (Man-in-the-Middle) vulnerability, with a CVSS Score of 9.1 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N allows an unauthenticated attacker to potentially interdict connections to remote hosts, which has high impact to confidentiality, high impact to integrity, no impact to availability, and requires no user interaction.
Atlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
- Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.15
- Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.23
See the release notes (https://confluence.atlassian.com/doc/confluence-release-notes-327.html). You can download the latest version of Confluence Data Center from the download center (https://www.atlassian.com/software/confluence/download-archives).
The National Vulnerability Database provides the following description for this vulnerability:
Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through 10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fixes the issue.