CVE-2026-75595: Atlassian BASM (Broken Authentication & Session Management) io.netty:netty-handler Dependency in Confluence Data Center
This Atlassian advisory covers CVE-2026-75595 in Confluence Data Center and Server, Jira Data Center and Server and Jira Service Management Data Center and Server.
- CVE-2026-75595
Key facts
- Vendor rating
- Critical, CVSS 9.1
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N· base score 9.1, scored by GitHub_MAttack vector: network. Attack complexity: low. Attack requirements: present. Privileges required: none. User interaction: none. Confidentiality impact on the vulnerable system: high. Integrity impact on the vulnerable system: high. Availability impact on the vulnerable system: none. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.- Weakness
- CWE-754: Improper Check for Unusual or Exceptional Conditions
- CISA SSVC
- Exploitation: none observed. Automatable: no. Technical impact: total. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Confluence Data Center and Server: 10.2.0 to 10.2.18 (LTS); Confluence Data Center and Server: 10.1.0 to 10.1.2; Confluence Data Center and Server: 10.0.2 to 10.0.3 and 13 more below
- Fixed in
- Confluence Data Center and Server: 11.0.0 Data Center Only, Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only, Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only and 4 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
BASM (Broken Authentication & Session Management) io.netty:netty-handler Dependency in Confluence Data Center. Affected: Confluence Data Center and Server, Jira Data Center and Server, Jira Service Management Data Center and Server.
Listed in Atlassian's Security Bulletin of October 20 2026.
Text from the source record.
- Confluence Data Center and Server: 10.2.0 to 10.2.18 (LTS)
- Confluence Data Center and Server: 10.1.0 to 10.1.2
- Confluence Data Center and Server: 10.0.2 to 10.0.3
- Confluence Data Center and Server: 9.5.1 to 9.5.4
- Confluence Data Center and Server: 9.4.0 to 9.4.1
- Confluence Data Center and Server: 9.3.1 to 9.3.2
- Confluence Data Center and Server: 9.2.0 to 9.2.25 (LTS)
- Confluence Data Center and Server: 9.1.1
- Confluence Data Center and Server: 8.9.8
- Confluence Data Center and Server: 8.5.17 to 8.5.31 (LTS)
- Confluence Data Center and Server: 7.19.29 to 7.19.30 (LTS)
- Jira Data Center and Server: 11.3.0 to 11.3.11 (LTS)
- Jira Data Center and Server: 11.2.0 to 11.2.1
- Jira Data Center and Server: 11.1.0 to 11.1.1
- Jira Data Center and Server: 11.0.0 to 11.0.1
- Jira Data Center and Server: 10.7.1 to 10.7.4
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-75595
Upgrade to a fixed release named by Atlassian:
- Confluence Data Center and Server: 11.0.0 Data Center Only
- Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only
- Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only
- Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only
- Jira Data Center and Server: 10.3.26 (LTS) Data Center Only
- Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only
- Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Confluence Data Center and Server: 11.0.0 Data Center Only; Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only; Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only; Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only.
Support dates for the fixed release lines
- Atlassian Confluence 11.0: support ends
- Atlassian Confluence 10.2: support ends
- Atlassian Confluence 9.2: support ends
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