Threat landscape
high

Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye und Jira): Schwachstelle ermöglicht Offenlegung von Informationen

WID-SEC-2026-3755 · first 06.10.2026 · updated 08.10.2026 · CVSS 8,6

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What it is about

Bamboo ist ein Werkzeug zur kontinuierlichen Integration und Bereitstellung, das automatisierte Builds, Tests und Freigaben in einem einzigen Arbeitsablauf verbindet. Bitbucket ist ein Git-Server zur Sourcecode-Versionskontrolle. Confluence ist eine kommerzielle Wiki-Software. Crucible ist eine Code-Review-Lösung für Unternehmensteams. Fisheye ist ein Quellcode-Repository-Browser für Unternehmensteams. Jira ist eine Webanwendung zur Softwareentwicklung. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Atlassian Bamboo, Atlassian Bitbucket, Atlassian Confluence, Atlassian Crucible, Atlassian Fisheye und Atlassian Jira ausnutzen, um Informationen offenzulegen.

Under what conditions?

Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.

What can happen in the worst case

An attacker could use the vulnerability to

  • Informationen offenzulegen

Am I affected?

Affected according to the BSI:

  • Atlassian Bamboo <10.2.24
  • Atlassian Bamboo <12.1.12
  • Atlassian Bitbucket <9.4.26
  • Atlassian Bitbucket <10.2.8
  • Atlassian Bitbucket <10.5.1
  • Atlassian Confluence <9.2.26
  • Atlassian Confluence <10.2.19
  • Atlassian Crucible <4.9.15
  • Atlassian Fisheye <4.9.15
  • Atlassian Jira Service Management <5.12.40
  • Atlassian Jira Service Management <10.3.26
  • Atlassian Jira Service Management <11.3.12

and 3 more

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Atlassian Bamboo 10.2.24
  • Atlassian Bamboo 12.1.12
  • Atlassian Bitbucket 9.4.26
  • Atlassian Bitbucket 10.2.8
  • Atlassian Bitbucket 10.5.1
  • Atlassian Confluence 9.2.26
  • Atlassian Confluence 10.2.19
  • Atlassian Crucible 4.9.15
  • Atlassian Fisheye 4.9.15
  • Atlassian Jira Service Management 5.12.40
  • Atlassian Jira Service Management 10.3.26
  • Atlassian Jira Service Management 11.3.12

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.

Information and sources

CVE: CVE-2026-21589

Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.

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