BASM (Broken Authentication & Session Management) in Bitbucket Data Center

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    • 8.8
    • High
    • CVE-2026-21582
    • Penetration Testing
    • CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
    • BASM (Broken Authentication & Session Management)
    • Bitbucket Data Center

      This High severity BASM (Broken Authentication & Session Management) vulnerability was introduced in versions 9.4.0, 10.2.0, and 10.4.0 of Bitbucket Data Center.

      This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to perform actions as another user.

      Atlassian recommends that Bitbucket 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:

      • Bitbucket Data Center 9.4: Upgrade to a release greater than or equal to 9.4.23
      • Bitbucket Data Center 10.2: Upgrade to a release greater than or equal to 10.2.6
      • Bitbucket Data Center 10.4: Upgrade to a release greater than or equal to 10.4.2

      See the release notes (https://confluence.atlassian.com/bitbucketserver/bitbucket-data-center-10-release-notes-1621492158.html). You can download the latest version of Bitbucket Data Center from the download center (https://www.atlassian.com/software/bitbucket/download-archives).

      This vulnerability was reported via our Penetration Testing program.

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