Security Bulletin - January 20 2026
January 2026 Security Bulletin
The vulnerabilities reported in this Security Bulletin include 30 high-severity vulnerabilities and 2 critical-severity vulnerabilities which have been fixed in new versions of our products, released in the last month.
CVEs reported in monthly Security Bulletins have been assessed as presenting a non-critical risk to Atlassian customers. Atlassian issues Critical Security Advisories for vulnerabilities that pose an immediate critical risk based on how our products actually use the affected components outside of our monthly Security Bulletin schedule as necessary.
Vulnerabilities are discovered through our Bug Bounty program, pen-testing processes, and third-party library scans.
INSTRUCTIONS
To fix all the vulnerabilities impacting your product(s), Atlassian recommends patching your instances to the latest version or one of the Fixed Versions for each product below. The listed Fixed Versions for each product are current as of January 20, 2026 (date of publication); visit the linked product Release Notes for the most up-to-date versions.
To search for CVEs or check your product versions for disclosed vulnerabilities, check the Vulnerability Disclosure Portal.
Released Security Vulnerabilities | |||||
|---|---|---|---|---|---|
Product & Release Notes | Affected Versions | Fixed Version | Vulnerability Summary | CVE ID | CVSS Severity |
|
| Race Condition at org.glassfish.jersey.core:jersey-client in Bamboo Data Center | 9.4 Critical This is a vulnerability in a non-Atlassian Bamboo dependency. Atlassian's application of this dependency presents a lower, non-critical assessed risk. | ||
8.4 High | |||||
DoS (Denial of Service) io.netty:netty-codec-http2 Dependency in Bamboo Data Center and Server | 8.2 High | ||||
SSRF (Server-Side Request Forgery) axios Dependency in Bamboo Data Center and Server | 7.7 High | ||||
|
| 8.7 High | |||
8.6 High | |||||
7.5 High | |||||
7.5 High | |||||
7.5 High | |||||
|
| XXE (XML External Entity Injection) in Confluence Data Center and Server Note: On December 17, 2025, we released an additional fix in versions 8.5.31, 9.2.13 and 10.2.2, and added to the December Bulletin post-publication. It has been included in this Bulletin for awareness. | 10 Critical This is a vulnerability in a non-Atlassian Confluence dependency. Atlassian's application of this dependency presents a lower, non-critical assessed risk. | ||
8.8 High | |||||
8.4 High | |||||
MITM (Man-in-the-Middle) org.postgresql:postgresql Dependency in Confluence Data Center and Server | 8.2 High | ||||
|
| 8.4 High | |||
XXE (XML External Entity Injection) in Crowd Data Center and Server | 7.9 High | ||||
7.5 High | |||||
DoS (Denial of Service) org.apache.struts:struts2-core Dependency in Crowd Data Center and Server | 7.5 High | ||||
|
| DoS (Denial of Service) qs Dependency in Jira Software Data Center and Server | 8.7 High | ||
8.6 High | |||||
DoS (Denial of Service) cross-spawn Dependency in Jira Software Data Center and Server | 7.7 High | ||||
DoS (Denial of Service) ansi-regex Dependency in Jira Software Data Center and Server | 7.5 High | ||||
7.4 High | |||||
Injection cipher-base Dependency in Jira Data Center and Server | 7.4 High | ||||
XSS (Cross Site Scripting) dompurify Dependency in Jira Software Data Center and Server | 7.3 High | ||||
|
| DoS (Denial of Service) qs Dependency in Jira Service Management Data Center and Server | 8.7 High | ||
DoS (Denial of Service) cross-spawn Dependency in Jira Service Management Data Center and Server | 7.7 High | ||||
DoS (Denial of Service) ansi-regex Dependency in Jira Service Management Data Center and Server | 7.5 High | ||||
7.5 High | |||||
DoS (Denial of Service) semver Dependency in Jira Service Management Data Center | 7.5 High | ||||
DoS (Denial of Service) path-to-regexp Dependency in Jira Service Management Data Center and Server | 7.5 High | ||||
7.5 High | |||||
XSS (Cross Site Scripting) dompurify Dependency in Jira Service Management Data Center and Server | 7.3 High | ||||
Injection sha.js Dependency in Jira Service Management Data Center and Server | 7.4 High | ||||
Injection cipher-base Dependency in Jira Service Management Data Center and Server | 7.4 High | ||||
Frequently Asked Questions:
Why is my Feature Version not listed in a Fixed Version? You may be using an unsupported version and need to patch to the latest version or Long-Term Support (LTS) version.
What are the most up-to-date Data Center product versions? You can always check the software download portal or visit the product-specific download pages.
I am using an LTS, why is it not listed in the Fixed Versions? Your LTS version may not have been updated yet or a backported fix may not have been feasible. Please see our Security Bug Fix Policy for more information. We recommend upgrading your products to the latest versions. For the latest fixed versions, visit the release notes linked in the vulnerability table.
Questions about the bulletin, have feedback? Let us know! Read more about our bulletins and feel free to contribute feedback on our latest Community Post
To search for CVEs or check your products versions for disclosed vulnerabilities, check the Vulnerability Disclosure Portal.