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CVE-2026-43886— Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access

Quick assessment

Affected
outline outline
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Outline是Outline开源的一个知识库。 Outline 0.84.0版本至1.6.1版本存在安全漏洞，该漏洞源于OAuthInterface.validateScope()中的逻辑错误使用Array.some()验证请求的OAuth范围，导致如果任何单个范围有效则接受整个范围数组，攻击者可通过请求范围read 来走私通配符范围，将只读OAuth令牌升级为包括写入、删除和管理操作在内的完全无限制API访问。

CVSS 8.2 · High EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
outline outline >= 0.84.0, < 1.7.0 affected
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I. Basic Information for CVE-2026-43886

Vulnerability Information
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Vulnerability Title
Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Outline 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Outline是Outline开源的一个知识库。 Outline 0.84.0版本至1.6.1版本存在安全漏洞，该漏洞源于OAuthInterface.validateScope()中的逻辑错误使用Array.some()验证请求的OAuth范围，导致如果任何单个范围有效则接受整个范围数组，攻击者可通过请求范围read *来走私通配符*范围，将只读OAuth令牌升级为包括写入、删除和管理操作在内的完全无限制API访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
outline outline >= 0.84.0, < 1.7.0 -

II. Public POCs for CVE-2026-43886

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III. Intelligence Information for CVE-2026-43886

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Vendor Advisories for CVE-2026-43886 (1)

Same Patch Batch · outline · 2026-05-11 · 6 CVEs total

CVE-2026-43888 8.7 HIGH Outline: Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import
CVE-2026-43890 7.7 HIGH Outline: IDOR in subscriptions.create allows cross-tenant subscription on private document
CVE-2026-43887 7.3 HIGH Outline: Stored XSS via Comment Mentions
CVE-2026-43889 6.5 MEDIUM Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share
CVE-2026-44695 5.8 MEDIUM Outline: Slack OAuth state can link a victim Outline account to an attacker Slack identity

IV. Related Vulnerabilities

Same product: outline
Same vendor: outline
Same weakness: CWE-269

V. Comments for CVE-2026-43886

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