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Vulnerability record · CVE-2026-43886 · published 11 May 2026

CVE-2026-43886: Improper privilege management vulnerability

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope() uses Array.some() to validate requested OAuth scopes, causing the function to accept the entire scope array if any single scope is valid. An attacker can smuggle the wildcard * scope by requesting scope=read *, escalating a read-only OAuth token to full unrestricted API access including write, delete, and admin operations. This vulnerability is fixed in 1.7.0.

8.2 CVSS 3.1 High EPSS 0.30% · top 79.3% CWE-269 · Improper privilege management Deferred
8.2CVSS 3.1 base score
0.30%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, a logic error in OAuthInterface.validateScope() uses Array.some() to validate requested OAuth scopes, causing the function to accept the entire scope array if any single scope is valid. An attacker can smuggle the wildcard * scope by requesting scope=read *, escalating a read-only OAuth token to full unrestricted API access including write, delete, and admin operations. This vulnerability is fixed in 1.7.0.

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

References

LinkTags
https://github.com/outline/outline/security/advisories/GHSA-7732-6qrg-wjf4
https://github.com/outline/outline/security/advisories/GHSA-7732-6qrg-wjf4

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Source: NIST National Vulnerability Database (record CVE-2026-43886), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.