CVE-2026-21582
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, manipulate files, conduct a cross-site scripting attack, conduct a SQL injection attack, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities in Atlassian products allow remote code execution, denial of service, information disclosure, cross-site scripting, SQL injection, and security bypass.
- Who is affected
- Atlassian Bamboo, Bitbucket, Confluence, Crucible, Fisheye, and Jira deployments across multiple versions.
- Urgency
- High priority; vulnerabilities are actively being exploited in the wild.
- Action
- Apply security patches for each affected product as provided by Atlassian immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Advisory coverage (2)
- highexploited[NEW] [high] Atlassian Products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, and Jira): Multiple vulnera…cert-bund · 2026-08-19
- unknownCVE-2026-21582: This High severity BASM (Broken Authentication & Session Management) vulnerability known as CV…nvd · 2026-08-18
External references
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[](https://www.csirts.com/cve/CVE-2026-21582)