EUVD-2026-62205
GHSA-88w8-m3v4-74h6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network injection (PR:N) but stored XSS requires a victim to view the content (UI:R), with scope change into the victim's session (S:C) enabling privilege escalation; availability impact not evidenced.
Primary rating from Vendor (atlassian).
CVSS VectorVendor: atlassian
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored cross-site scripting combined with privilege escalation in Confluence Data Center and Server lets an unauthenticated attacker persist malicious HTML/JavaScript that runs in a victim's browser, enabling actions performed as a higher-privileged user and abuse of insecure default configurations. Atlassian rates it Critical (vendor CVSS 4.0 score 9.3; the advisory body text separately cites 8.6), and it affects a long list of 7.x through 10.2.x branches. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires reaching a Confluence content field that stores attacker input and is later rendered to other users; per the vendor CVSS the attacker needs no authentication (PR:N) and network access to the Confluence web interface. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) describes a network-reachable, low-complexity, unauthenticated attack with high impact to confidentiality, integrity, and availability - a genuine high-priority profile for an internet- or intranet-exposed collaboration server. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the latest Confluence Data Center and Server release, which Atlassian recommends as the primary fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Confluence Data Center and Server instances in your environment and confirm which versions (7.x-10.2.x) are affected; if affected instances exist, immediately restrict network access to trusted internal IP ranges and enable detailed audit logging of page creation, modification, and administrative activities. …
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External POC / Exploit Code
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