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CVE-2026-21586

Atlassian / Confluence Data Center PUBLISHED

Description (CNA)

This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 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 Improper Authorization vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code. 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 9.2: Upgrade to a release greater than or equal to 9.2.24 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.17 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]). This vulnerability was reported via our Penetration Testing program.

Affected (CNA)

Vendor / productVersions
Atlassian / Confluence Data Centeraffected 10.2.1 to 10.2.15; affected 10.1.0 to 10.1.2; affected 10.0.2 to 10.0.3; affected 9.5.1 to 9.5.4; affected 9.4.0 to 9.4.1; affected 9.3.1 to 9.3.2; affected 9.2.0 to 9.2.23; affected 9.1.1; affected 8.9.7 to 8.9.8; affected 8.5.16 to 8.5.31; affected 7.19.28 to 7.19.30; unaffected 10.2.17 to 10.2.18; unaffected 9.2.24 to 9.2.25

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.