CVE-2026-21589Atlassian Data Center — Unauthenticated Web-Root File Access
Several Atlassian Data Center products let a remote attacker without a login read specific files in the web application root. The attacker must already know each file's exact name and path, and cannot list directories, but some configurations hold sensitive files there.
Read the risk
THE VITAL STATS- CVSS score
- 7.5/ 10 CVSS v3.1
- EPSS probability
- 99.7% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-10-05
- Added to KEV
- 2026-10-15
- CISA due date
- 2026-10-18
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- unclassified
- MITRE ATT&CK
- —
- Severity
- high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attacker needsNetwork access to an affected instance and prior knowledge of the target file's exact name and path.
Fixed inBitbucket Data Center 9.4.26, 10.2.8, 10.5.1, Confluence Data Center 9.2.26, 10.2.19, Crowd Data Center 6.3.7, 7.0.3, 7.1.7, 7.2.4, Jira Software Data Center 9.12.40, 10.3.26, 11.3.12, Jira Service Management Data Center 5.12.40, 10.3.26, 11.3.12, Bamboo Data Center 10.2.24, 12.1.12, Crucible 4.9.15, Fisheye 4.9.15
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisoryjira.atlassian.comjira.atlassian.com
- 04Vendor advisoryjira.atlassian.comjira.atlassian.com
- 05Vendor advisoryjira.atlassian.comjira.atlassian.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, published_at, references | nvd.nist.gov | 2026-11-05 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added, exploitation.kev_due | cisa.gov | 2026-11-05 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-11-05 | scrty-crds-pipeline/0.1 | high |
| title, subtitle, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-11-05 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
History unavailable — this build has no Git history for the card file.