Outline: Stored XSS via Comment Mentions_CVE-2026-43887

7.3 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Basic Information

ID CVE-2026-43887

Source GitHub_M

Published May 11, 2026 at 21:05

Affected Product

Vendor outline

Product outline

Version >= 0.84.0, < 1.7.0

Affected Versions outline outline >= 0.84.0, < 1.7.0

CWE Classification

CWE-79

References

github.com /outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh

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    "published": "2026-05-11T21:05:42.302Z",
    "modified": "2026-05-11T21:05:42.302Z",
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