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2026-015: Critical Vulnerability in Multiple Atlassian Products

On 5 October 2026, Atlassian published a security advisory addressing a critical arbitrary file access vulnerability. It affects Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye.<br> CERT-EU strongly recommends upgrading all affected installations to a fixed version as soon as possible, starting with instances accessible from the internet. CERT-EU also recommends checking access logs for signs of exploitation.<br>
CRITICAL
Severity & confidence
Source severitycritical
Platform severitycritical
Confidencehigh
Exploitationunknown
CVSS-
Affected
CountriesEU
Reporting sources (1)
CERT-EU - Security Advisories
Open source โ†—
Timeline & provenance
Published2026-10-07T07:56:09
Last updated2026-10-21T05:52:00
Ingested2026-10-07T07:56:09
FreshnessNEAR-REAL-TIME
Threat typeexploitation
Recommended action
No recommended action published with this item - review the original source.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: gov ยท Original: CERT-EU - Security Advisories