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Vulnerability record · CVE-2026-43887 · published 11 May 2026

CVE-2026-43887: Cross-site scripting vulnerability

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.

7.3 CVSS 3.1 High EPSS 0.43% · top 64.8% CWE-79 · Cross-site scripting Deferred
7.3CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-43887), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.