CVE-2019-20102 Cross-site scripting in Confluence Server

What is CVE-2019-20102?

CVE-2019-20102 is a medium-severity cross-site scripting vulnerability in Atlassian Confluence Server, published on 22 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

The 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.

Weakness: CWE-79

Which versions are affected by CVE-2019-20102?

It affects 1 product.

Products include Atlassian Confluence Server.

How do I fix CVE-2019-20102?

No fix has been published for CVE-2019-20102 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2019-20102 being exploited?

There is no known exploitation of CVE-2019-20102 in the wild and no public exploit code.

Other vulnerabilities in Atlassian Confluence Server

• CVE-2019-3396 Atlassian Confluence Server and Data Center Server-Side Template Injection Exploited Critical 9.8
• CVE-2019-3398 Atlassian Confluence Server and Data Center Path Traversal Exploited High 8.8
• CVE-2017-7415 Auth bypass in n/a High 7.5
• CVE-2016-6668 Information disclosure in n/a High 7.5
• CVE-2012-6342 Cross-site request forgery in n/a Medium 6.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-65gh-pwxv-875j.