Security readout for executives and security teams
Plain-English summary
Certain older Atlassian Confluence Server versions could store attacker-supplied script through the attachment upload feature. If a victim later viewed affected content, the script could run in that user's browser. The source bundle provides affected version ranges but no CVSS score or evidence of active exploitation.
Executive priority
Treat this as a targeted remediation item for legacy Confluence Server. It is not listed as actively exploited in the provided sources, but stored XSS in a collaboration platform can create credential, session, and trust risks if exposed to untrusted contributors.
Technical view
CVE-2019-20102 is a stored cross-site scripting issue in Confluence Server attachment uploads. A malicious attachment with a modified mimeType parameter could allow remote attackers to persist script content. Reported affected ranges are 6.14.0 through 6.14.3 and 6.15.0 before 6.15.5.
Likely exposure
Exposure is limited to organizations still running affected Confluence Server versions and allowing attachment uploads. Internet-facing Confluence, broad contributor access, or untrusted user accounts would raise business risk. The sources do not identify affected Confluence Cloud or Data Center versions.
Exploitation context
The provided sources do not show CISA KEV listing, active exploitation, public exploit maturity, or observed campaigns. The attack class is stored XSS, meaning impact depends on who can upload attachments and which users later interact with the stored content.
Researcher notes
The bundle lacks CVSS, CWE, detailed exploit prerequisites, and confirmed fixed versions beyond the version boundaries in the CVE description. Avoid expanding scope beyond Confluence Server. Validate branch-specific fixes directly against Atlassian's issue record before closure.
Mitigation direction
- Upgrade Confluence Server to a vendor-supported version outside the affected ranges.
- For 6.15.x, ensure the instance is at least 6.15.5 if remaining on that branch.
- Review Atlassian CONFSERVER-59358 for vendor-specific fix and advisory details.
- Restrict attachment upload permissions to trusted users until remediation is complete.
- Review recently uploaded attachments from untrusted accounts for suspicious metadata or behavior.
Validation and detection
- Inventory Confluence Server versions across production, staging, and legacy hosts.
- Confirm no instances run 6.14.0 through 6.14.3 or 6.15.0 through 6.15.4.
- Check whether attachment uploads are enabled and who can use them.
- Review access logs and audit records for unexpected attachment uploads.
- Verify remediation against Atlassian CONFSERVER-59358 rather than assuming package status.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-20102 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.atlassian.com/browse/CONFSERVER-59358CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.