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OpenAdvisories
High · 7.3 CVE-2026-43887 EUVD-2026-29331

Outline: Stored XSS via Comment Mentions

Published May 11, 2026 · Updated May 15, 2026 · Assigned by GitHub_M

Description

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, the Outline comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions. As a result, potentially dangerous protocols (e.g., javascript:) are not filtered, introducing a risk of client-side code execution. This vulnerability is fixed in 1.7.0.

Affected products

VendorProductAffectedFixed
outline outline >= 0.84.0, < 1.7.0 —

References