CVE-2026-43886

Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access

State: Published
Severity: 8.2 High
Published: May 11, 2026
Updated: May 12, 2026
Reserved: May 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-269 Improper Privilege Management

Affected Products

Product	Versions
outlineoutline	>= 0.84.0, < 1.7.0Affected

References

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

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