Outline is a service that allows for collaborative documentation. In versions 0.72.0 through 0.83.0, Outline introduced a feature which facilitates local file system storage capabilities as an optional file storage strategy. This feature allowed a CSP bypass as well as a ContentType bypass that might facilitate further attacks. In the case of self-hosting and using Outline FILE_STORAGE=local on the same domain as the Outline application, a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions, allowing script execution within the context of another user. This is fixed in version 0.84.0.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/outline/outline/commit/18bc93c9c207329244c6909606a2393e863892a3 Patch
- https://github.com/outline/outline/security/advisories/GHSA-gcj7-c9jv-fhgf Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.8 · getoutlineNVD modified 2026-10-19 17:10
Affected (CPE criteria) 1
cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*