Atlassian flaws being used in attacks

CISA lists 14 flaws in Atlassian products as being used in attacks, most recently on 15 Oct 2026. 8 have been used in ransomware.

What to do

1. Update every Atlassian product you use.Install the updates Atlassian offers, on every device, and restart when asked. Each flaw below has a fix or clear advice; that’s one of CISA’s conditions for listing it.
2. If someone looks after IT for you, send them this page.Many of these are in equipment you don’t see: routers, firewalls, servers, the office network. Ask them to confirm each one is fixed, or that you don’t use the product.
3. Check anything else in the lookup.Search any app, company or CVE. Not being on CISA’s list doesn’t mean safe: keep updating either way.

Every flaw, newest first

1. Being used in attacksAdded by CISA on 15 Oct 2026
   Atlassian Multiple Products
   CVE-2026-21589Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
   Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.
   CISA’s required actionApply 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). Read all

   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.
   CVE recordNVD
2. Being used in attacksAdded by CISA on 12 Nov 2024
   Atlassian Jira Server and Data Center
   CVE-2021-26086Atlassian Jira Server and Data Center Path Traversal Vulnerability
   Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.
   CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
   CVE recordNVD
3. Being used in attacksUsed in ransomwareAdded by CISA on 24 Jan 2024
   Atlassian Confluence Data Center and Server
   CVE-2023-22527Atlassian Confluence Data Center and Server Template Injection Vulnerability
   Atlassian Confluence Data Center and Server contain an unauthenticated OGNL template injection vulnerability that can lead to remote code execution.
   CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
   CVE recordNVD
4. Being used in attacksUsed in ransomwareAdded by CISA on 7 Nov 2023
   Atlassian Confluence Data Center and Server
   CVE-2023-22518Atlassian Confluence Data Center and Server Improper Authorization Vulnerability
   Atlassian Confluence Data Center and Server contain an improper authorization vulnerability that can result in significant data loss when exploited by an unauthenticated attacker. There is no impact on confidentiality since the attacker cannot exfiltrate any data.
   CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
   CVE recordNVD
5. Being used in attacksUsed in ransomwareAdded by CISA on 5 Oct 2023
   Atlassian Confluence Data Center and Server
   CVE-2023-22515Atlassian Confluence Data Center and Server Broken Access Control Vulnerability
   Atlassian Confluence Data Center and Server contains a broken access control vulnerability that allows an attacker to create unauthorized Confluence administrator accounts and access Confluence.
   CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Read all

   Check all affected Confluence instances for evidence of compromise per vendor instructions and report any positive findings to CISA.
   CVE recordNVD
6. Being used in attacksAdded by CISA on 30 Sep 2022
   Atlassian Bitbucket Server and Data Center
   CVE-2022-36804Atlassian Bitbucket Server and Data Center Command Injection Vulnerability
   Multiple API endpoints of Atlassian Bitbucket Server and Data Center contain a command injection vulnerability where an attacker with access to a public Bitbucket repository, or with read permissions to a private one, can execute code by sending a malicious HTTP request.
   CISA’s required actionApply updates per vendor instructions.
   CVE recordNVD
7. Being used in attacksAdded by CISA on 29 Jul 2022
   Atlassian Confluence
   CVE-2022-26138Atlassian Questions For Confluence App Hard-coded Credentials Vulnerability
   Atlassian Questions For Confluence App has hard-coded credentials, exposing the username and password in plaintext. A remote unauthenticated attacker can use these credentials to log into Confluence and access all content accessible to users in the confluence-users group.
   CISA’s required actionApply updates per vendor instructions.
   CVE recordNVD
8. Being used in attacksUsed in ransomwareAdded by CISA on 2 Jun 2022
   Atlassian Confluence Server/Data Center
   CVE-2022-26134Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability
   Atlassian Confluence Server and Data Center contain a remote code execution vulnerability that allows for an unauthenticated attacker to perform remote code execution.
   CISA’s required actionImmediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Read all

   Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.
   CVE recordNVD
9. Being used in attacksUsed in ransomwareAdded by CISA on 28 Mar 2022
   Atlassian Confluence Server
   CVE-2021-26085Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
   Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability in the /s/ endpoint.
   CISA’s required actionApply updates per vendor instructions.
   CVE recordNVD
10. Being used in attacksAdded by CISA on 7 Mar 2022
    Atlassian Jira Server and Data Center
    CVE-2019-11581Atlassian Jira Server and Data Center Server-Side Template Injection Vulnerability
    Atlassian Jira Server and Data Center contain a server-side template injection vulnerability which can allow for remote code execution.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
11. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Atlassian Confluence Server and Data Center
    CVE-2021-26084Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
    Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
12. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Atlassian Crowd and Crowd Data Center
    CVE-2019-11580Atlassian Crowd and Crowd Data Center Remote Code Execution Vulnerability
    Atlassian Crowd and Crowd Data Center contain a remote code execution vulnerability resulting from a pdkinstall development plugin being incorrectly enabled in release builds.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
13. Being used in attacksAdded by CISA on 3 Nov 2021
    Atlassian Confluence Server and Data Center
    CVE-2019-3398Atlassian Confluence Server and Data Center Path Traversal Vulnerability
    Atlassian Confluence Server and Data Center contain a path traversal vulnerability in the downloadallattachments resource that may allow a privileged, remote attacker to write files. Exploitation can lead to remote code execution.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
14. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Atlassian Confluence Server and Data Server
    CVE-2019-3396Atlassian Confluence Server and Data Center Server-Side Template Injection Vulnerability
    Atlassian Confluence Server and Data Center contain a server-side template injection vulnerability that may allow an attacker to achieve path traversal and remote code execution.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD

From CISA’s Known Exploited Vulnerabilities catalog, updated 21 Oct 2026 (version 2026.10.21). CISA’s required actions are written for US government agencies. Atlassian on CISA’s site.