CVE-2026-90436: Atlassian Remote Code Execution in Confluence Data Center
This Atlassian advisory covers CVE-2026-90436 in Confluence Data Center.
Key facts
- Vendor rating
- Critical, CVSS 9.3
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H· base score 9.8, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: high. Availability impact: high.- Weakness
- CWE-470 Use of Externally-Controlled input to select classes or code ('unsafe reflection')
- CISA SSVC
- Exploitation: none observed. Automatable: yes. Technical impact: total. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Confluence Data Center: 1.x.x; Confluence Data Center: 2.x.x; Confluence Data Center: 3.x.x and 6 more below
- Fixed in
- Confluence Data Center: 9.2.28
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Confluence utilizes a third-party library Apache Axis as part of its XML-RPC and SOAP APIs. Apache Axis has published a critical vulnerability (CVE-2026-90436) that allows remote code execution.
To be vulnerable, the Confluence instance must have the ‘Remote API (XML-RPC & SOAP)’ enabled. Please note that this setting was turned off by default for new installations starting in Confluence 3.0.
This feature was fully removed in Confluence 10.0.
Affected product named by the advisory: Confluence Data Center.
Text from the source record.
- Confluence Data Center: 1.x.x
- Confluence Data Center: 2.x.x
- Confluence Data Center: 3.x.x
- Confluence Data Center: 4.x.x
- Confluence Data Center: 5.x.x
- Confluence Data Center: 6.x.x
- Confluence Data Center: 7.x.x
- Confluence Data Center: 8.x.x
- Confluence Data Center: 9.x.x
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-90436
Upgrade to a fixed release named by Atlassian:
- Confluence Data Center: 9.2.28
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Confluence Data Center: 9.2.28.
Support dates for the fixed release lines
- Atlassian Confluence 9.2: support ends
CVE-2026-90436 in other vendors' advisories
- Apache: CVE-2026-90436, critical severity, fixed in 41f3b4e8d04e310ca81f86b92630ab2c11d608bd
More Atlassian advisories
CVE-2026-21589Oct 5, 2026This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira ServiceCVE-2026-21588Sep 15, 2026This High severity DoS (Denial of Service) vulnerability was introducedCVE-2026-21586Sep 15, 2026This High severity Improper Authorization vulnerability was introducedCVE-2026-21580Aug 18, 2026This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and SecurityCVE-2026-21577Jul 21, 2026This High severity DoS (Denial of Service) vulnerability was introducedCVE-2026-21579Jul 21, 2026This High severity Information Disclosure vulnerability was introduced
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