Cross-site scripting in Atlassian Confluence Data Center
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was introduced in versions 7.1.1, 7.4.0, 7.13.0, 7.17.0, 7.19.0, 8.0.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center and Server. This Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability, with a CVSS Score of 8.6, allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser, perform actions as a higher-privileged user, and to get into the system utilizing loopholes exposed from security best-practices being overlooked. Atlassian recommends that Confluence Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Confluence Data Center and Server 9.2: Upgrade to a release greater than or equal to 9.2.21 Confluence Data Center and Server 10.2: Upgrade to a release greater than or equal to 10.2.13 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Bug Bounty program.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Atlassian | Confluence Data Center | 10.2.0 to 10.2.11; 10.1.0 to 10.1.2; 10.0.2 to 10.0.3; 9.5.1 to 9.5.4; 9.4.0 to 9.4.1; 9.3.1 to 9.3.2; 9.2.0 to 9.2.20; 9.1.0 to 9.1.1; 9.0.3; 8.9.6 to 8.9.8; 8.5.15 to 8.5.31; 7.19.27 to 7.19.30 | 10.2.13 to 10.2.15, 9.2.21 to 9.2.23 | Patch available | CNA |
| Atlassian | Confluence Server | 8.5.15 to 8.5.31; 7.19.27 to 7.19.30 | — | No fix listed | CNA |
- Confluence Data Center VendorAtlassian Affected 10.2.0 to 10.2.11; 10.1.0 to 10.1.2; 10.0.2 to 10.0.3; 9.5.1 to 9.5.4; 9.4.0 to 9.4.1; 9.3.1 to 9.3.2; 9.2.0 to 9.2.20; 9.1.0 to 9.1.1; 9.0.3; 8.9.6 to 8.9.8; 8.5.15 to 8.5.31; 7.19.27 to 7.19.30 Fixed in 10.2.13 to 10.2.15, 9.2.21 to 9.2.23 Patch available CNA
- Confluence Server VendorAtlassian Affected 8.5.15 to 8.5.31; 7.19.27 to 7.19.30 Fixed in — No fix listed CNA
Remediation
- Fix · CNA Confluence Data Center (Atlassian) Fixed in 10.2.13 to 10.2.15, 9.2.21 to 9.2.23
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21580
- 2026-10-03 Alias added: GHSA-88w8-m3v4-74h6
References
More Atlassian vulnerabilities
- TI-2023-08765 Injection in Atlassian Confluence Data Center KEVCVSS 3.1CRITICAL 9.8
- TI-2023-08757 Improper input validation in Atlassian Confluence Data Center KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09600 Hard-coded credentials in Atlassian Questions For Confluence KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09596 Expression language injection in Atlassian Confluence Data Center KEVCVSS 3.1CRITICAL 9.8
- TI-2021-08036 Expression language injection in Atlassian Confluence Server KEVCVSS 3.1CRITICAL 9.8
- TI-2019-08654 Injection in Atlassian Jira Server and Data Center KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-21580 · CVE Program
- CVE-2026-21580 · NVD
- FIRST EPSS
- GHSA-88w8-m3v4-74h6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences