Confluence ServerApplication · Atlassian
CVE-2019-20102
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe attachment-uploading feature in Atlassian Confluence Server from version 6.14.0 through version 6.14.3, and version 6.15.0 before version 6.15.5 allows remote attackers to achieve stored cross-site- scripting (SXSS) via a malicious attachment with a modified `mimeType` parameter.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA stored cross-site scripting (SXSS) vulnerability exists in Atlassian Confluence Server's attachment uploading feature. Attackers can upload malicious attachments with a modified mimeType parameter, causing the malicious payload to be stored and executed when other users view or interact with the attachment.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Confluence ServerApplication
>= 6.14.0, <= 6.14.3>= 6.15.0, < 6.15.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Confluence Server versionNavigate to Confluence Admin > General Configuration or check the /confluence/aboutconfluence page to find the installed version numberAffected if The installed version is >= 6.14.0 and <= 6.14.3, OR >= 6.15.0 and < 6.15.5
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Identify attachment upload capabilityVerify that the Confluence instance has the attachments feature enabled under General Configuration > AttachmentsAffected if Attachments are enabled and users have permission to upload files
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Inspect attachment storage for suspicious mimeType valuesQuery the database or check attachments table for records where the contentType or mimeType differs from standard MIME types (for example, text/html, application/javascript in fields that should contain binary types like image/png or application/pdf)Affected if Any attachment records exist with unexpected or potentially malicious mimeType values, especially those containing HTML or script content
A user is affected if they are running Confluence Server versions 6.14.0 through 6.14.3 or 6.15.0 through 6.15.4 with attachments enabled, and suspicious mimeType values are present in the attachment database.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data6.15.5
Upgrade Confluence Server to version 6.14.4, 6.15.5, or later. Additionally, audit existing attachments for malicious mimeType values and sanitize or remove any suspicious content.
Fix this in Confluence Server
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-20102 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-20102 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data