This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Ba
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- 13 proofs of concept on GitHub, 1 Nuclei template
- Exploitation: active
- Automatable: no
- Technical impact: total
Summary
This vulnerability affects Atlassian Data Center products, including Bitbucket, Confluence, Jira Software, Jira Service Management, Bamboo, Crowd, Crucible, and Fisheye. It allows an unauthenticated remote attacker to access specific files within the web application root directory, which could expose sensitive information in some configurations.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA SSVC assessment
Exploitation: active · Automatable: no · Technical impact: total
- CISA remediation deadline
Due date for US federal agencies to patch
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
- Record last updated
Affected versions
- Atlassian Bamboo Data Center
Version range not reported
- Atlassian Bitbucket Data Center
Version range not reported
- Atlassian Confluence Data Center
Version range not reported
- Atlassian Crowd Data Center
Version range not reported
- Atlassian Crucible Data Center
Version range not reported
- Atlassian Fisheye Data Center
Version range not reported
- Atlassian Jira Service Management Data Center
Version range not reported
- Atlassian Jira Software Data Center
Version range not reported
References 22
jira.atlassian.com
GitHub · projectdiscovery/nuclei-templates
GitHub · 0xredash/CVE-2026-21589
GitHub · BimBoxH4/CVE-2026-21589
GitHub · CompleTech-Security/atlassian-cve-2026-21589-check
GitHub · MarcusProgram/CVE-2026-21589
GitHub · aduli198/CVE-2026-21589
GitHub · gotr00t0day/CVE-2026-21589
GitHub · murrez/CVE-2026-21589
GitHub · renzi25031469/CVE-2026-21589
GitHub · rxsklife/CVE-2026-21589
GitHub · tc4dy/CVE-2026-21589-PoC-Exploit
GitHub · watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589
GitHub · webserverdude/f5_CVE-2026-21589_mitigation
GitHub · ynsmroztas/AtlasSniper
Questions about CVE-2026-21589
What does this mean?
An unauthenticated attacker can access specific files within the web application root directory of the affected Data Center products.Source: jira.atlassian.com, jira.atlassian.com, jira.atlassian.com
Am I affected, and how do I check?
The advisory lists all Bamboo, Bitbucket, and Confluence Data Center versions before the fixed versions as affected, and also names Crowd, Crucible, Fisheye, Jira Service Management, and Jira Software Data Center. To check a version, compare the installed version against the fixed versions listed in Atlassian's advisory.Source: jira.atlassian.com, jira.atlassian.com, jira.atlassian.com
What should I do about it?
Atlassian recommends upgrading to one of the fixed versions listed in its advisory. The specific fixed version numbers are not in the checked facts, so confirm them in the advisory.Source: jira.atlassian.com, jira.atlassian.com, jira.atlassian.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-10-15, which means it has evidence of attacks. Public exploit code exists (a Nuclei template, a proof of concept on GitHub).Source: cisa.gov, cve.now feed data
What if there's no patch?
Block requests matching the regex pattern given in the advisory at a web application firewall or proxy, or use Tomcat's RewriteValve.Source: jira.atlassian.com, jira.atlassian.com, jira.atlassian.com