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CVE-2026-43889— Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share

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 1.7.0之前版本存在安全漏洞，该漏洞源于shares.create API同时接受collectionId和documentId且当published=false时仅验证每个的读取访问权限，跳过共享权限检查，后续shares.update使用OR策略授权发布，持有无关集合共享权限的攻击者可发布暴露其无法合法共享的任意文档的共享，使其对未经验证用户公开可访问。

CVSS 6.5 · Medium EPSS 0.35% · P27

Possible ATT&CK Techniques 2 AI

T1530.001 T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
outline outline < 1.7.0 affected
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I. Basic Information for CVE-2026-43889

Vulnerability Information
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Vulnerability Title
Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share
Source: CVE Program / CVE List V5
Vulnerability Description
Outline is a service that allows for collaborative documentation. Prior to 1.7.0, the shares.create API accepts both collectionId and documentId simultaneously and, when published=false, only verifies read access for each—skipping the "share" permission check. A subsequent shares.update authorizes publication using an OR policy (can share collection OR can share document), so an attacker who holds share permission on one unrelated collection can publish a share that exposes an arbitrary document they cannot legitimately share, making it publicly accessible to unauthenticated users. This vulnerability is fixed in 1.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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 1.7.0之前版本存在安全漏洞，该漏洞源于shares.create API同时接受collectionId和documentId且当published=false时仅验证每个的读取访问权限，跳过共享权限检查，后续shares.update使用OR策略授权发布，持有无关集合共享权限的攻击者可发布暴露其无法合法共享的任意文档的共享，使其对未经验证用户公开可访问。
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 < 1.7.0 -

II. Public POCs for CVE-2026-43889

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III. Intelligence Information for CVE-2026-43889

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Vendor Advisories for CVE-2026-43889 (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-2026-43886 8.2 HIGH Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Ac
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-2026-44695 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-863

V. Comments for CVE-2026-43889

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