Atlassian — Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
CISA KEV · in the CISA KEV catalog since 2026-10-15
Listed in the CISA KEV catalog, and an EPSS probability of 0.127.
Out-of-Band / Urgent Remediation
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
| Measure | Value | Source | What it means |
|---|---|---|---|
| CVSS base score | 9.3 | NVD | How severe the flaw is in itself. It does not say how likely an attack is. |
| FIRST EPSS | 0.127 (96.2nd pctl) | FIRST | FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. |
| Actively exploited | Confirmed | CISA KEV | Whether a source of record has confirmed attacks using it in the wild. |
| Ransomware campaign use | Unknown or none | CISA KEV | Whether CISA has seen ransomware operators use it. |
| CISA remediation deadline | 2026-10-18 — CISA federal deadline in 1 day | CISA KEV | The date US federal agencies must have fixed or mitigated it. |
| Fixed in | bitbucket data center: update to 9.4.26 or later | bitbucket data center: update to 10.2.8 or later | bitbucket data center: update to 10.5.1 or later | bitbucket server: update to a version newer than 8.14.6 | confluence data center: update to 9.2.26 or later | confluence data center: update to 10.2.19 or later | NVD | The version(s) the vendor has published as fixed, where NVD records one. |
| Public exploit module | None known | Metasploit | Module existing is not the same as active exploitation. |
| EUVD cross-reference | Listed | ENISA EUVD | ENISA's own vulnerability database entry for this CVE, where one exists. |
Impacted software or hardware
+1 more affected product — see the full list at NVD.
Fixed versions: bitbucket data center: update to 9.4.26 or later | bitbucket data center: update to 10.2.8 or later | bitbucket data center: update to 10.5.1 or later | bitbucket server: update to a version newer than 8.14.6 | confluence data center: update to 9.2.26 or later | confluence data center: update to 10.2.19 or later
Remediation: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Remediation basis: CISA KEV required action
ENISA EUVD also lists this CVE at CVSS 9.3 (v4.0), assigned by atlassian. Source: euvd.enisa.europa.eu.
EVULNABLE has recorded 1 day of EPSS history for this CVE so far - not enough yet for a chart. Check back as more days accumulate.
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2026-21589 is one of the entries ranked on the priority feed and in the non-Microsoft advisories.
