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Type:
Public Security Vulnerability
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Resolution: Fixed
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Priority:
High
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Affects Version/s: 7.1.0, 7.2.0, 7.3.1, 7.4.0, 7.5.0, 7.6.0, 7.7.2, 7.8.0, 7.9.0, 7.11.0, 7.12.0, 7.13.0, 7.14.0, 7.15.0, 7.16.0, 7.17.0, 7.18.0, 7.19.0, 7.20.0, 8.0.0, 8.1.0, 8.2.0, 8.3.0, 8.4.0, 8.5.0, 8.6.0, 8.8.0, 8.7.1, 8.9.0, 8.9.1, 8.9.2, 8.9.3, 8.9.4, 9.1.0, 9.0.1, 8.9.5, 9.0.2, 9.0.3, 8.9.6, 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, 10.2.15, 9.2.23, 9.2.24, 9.2.25
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Component/s: None
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8.1
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High
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CVE-2026-54513
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Atlassian (Internal)
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CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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Insecure Deserialization
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Confluence Data Center
This High severity Insecure Deserialization vulnerability was introduced in versions 7.1.0, 7.2.0, 7.3.1, 7.4.0, 7.5.0, 7.6.0, 7.7.2, 7.8.0, 7.9.0, 7.11.0, 7.12.0, 7.13.0, 7.14.0, 7.15.0, 7.16.0, 7.17.0, 7.18.0, 7.19.0, 7.20.0, 8.0.0, 8.1.0, 8.2.0, 8.3.0, 8.4.0, 8.5.0, 8.6.0, 8.7.1, 8.8.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center.
This Insecure Deserialization vulnerability, with a CVSS Score of 8.1 and a CVSS Vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has high impact to confidentiality, high impact to integrity, high 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:
- 11.0: Upgrade to a release greater than or equal to 11.0.0
- 10.2: Upgrade to a release greater than or equal to 10.2.17
- 9.2: Upgrade to a release greater than or equal to 9.2.26
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:
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.10.0 until 2.18.8, 2.21.4, and 3.1.4, BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist. This vulnerability is fixed in 2.18.8, 2.21.4, and 3.1.4.