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CVE-2026-44695— Outline: Slack OAuth state can link a victim Outline account to an attacker Slack identity

CVSS 5.8 · Medium EPSS 0.02% · P4

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
outlineoutline< 1.7.1affected
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I. Basic Information for CVE-2026-44695

Vulnerability Information
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Vulnerability Title
Outline: Slack OAuth state can link a victim Outline account to an attacker Slack identity
Source: NVD (National Vulnerability Database)
Vulnerability Description
Outline is a service that allows for collaborative documentation. Prior to 1.7.1, the Slack integration callback for GET /auth/slack.post accepts an unsigned, session-independent OAuth state value. A third party who can obtain a Slack OAuth code for the same Outline Slack client can make a logged-in Outline user complete the callback and link that user's Outline account to the attacker's Slack team_id and user_id. The linked Slack identity can then use the Slack /outline search command as the victim Outline user. This vulnerability is fixed in 1.7.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Outline 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Outline是Outline开源的一个知识库。 Outline 1.7.1之前版本存在跨站请求伪造漏洞，该漏洞源于Slack集成回调接受未签名的OAuth状态值，可能导致第三方将用户账户链接到攻击者的Slack团队。
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

VendorProductAffected VersionsCPESubscribe
outlineoutline < 1.7.1 -

II. Public POCs for CVE-2026-44695

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III. Intelligence Information for CVE-2026-44695

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

CVE-2026-438888.7 HIGHOutline: Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import
CVE-2026-438868.2 HIGHOutline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Ac
CVE-2026-438907.7 HIGHOutline: IDOR in subscriptions.create allows cross-tenant subscription on private document
CVE-2026-438877.3 HIGHOutline: Stored XSS via Comment Mentions
CVE-2026-438896.5 MEDIUMOutline: Unauthorized Document Publication via Mixed collectionId+documentId Share

IV. Related Vulnerabilities

Same product: outline
Same vendor: outline
Same weakness: CWE-352

V. Comments for CVE-2026-44695

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