CVE-2026-39304
An attacker can exploit multiple vulnerabilities in Atlassian Bamboo, Atlassian Bitbucket, Atlassian Confluence, Atlassian Crucible, Atlassian Fisheye, and Atlassian Jira to execute arbitrary code, conduct a denial of service attack, disclose information, perform a cross-site scripting attack, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to execute arbitrary code, conduct denial of service attacks, disclose information, perform cross-site scripting attacks, and bypass security measures.
- Who is affected
- Deployments of Atlassian Bamboo, Bitbucket, Confluence, Crucible, Fisheye, and Jira are affected.
- Urgency
- Remediation is urgent due to the high severity and confirmed exploitation of these vulnerabilities.
- Action
- Apply the latest security patches provided by Atlassian.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.90% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
Advisory coverage (1)
External references
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[](https://www.csirts.com/cve/CVE-2026-39304)