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CVE-2026-113611— Outline before 1.8.0 Information Disclosure via Orphaned Webhook Subscriptions

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 在 1.8.0 版本之前存在一个不恰当的访问撤销漏洞，导致已被删除的管理员仍能继续接收文档内容。这是因为 UserDeletedProcessor 从未禁用其 WebhookSubscription 记录。此前注册过 webhook 的前管理员，会通过 DeliverWebhookTask 在每次匹配的工作区事件发生时，持续接收到完整的文档正文，包括 Markdown 和 Yjs 数据。

CVSS 4.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
outline outline < 1.8.0 affected
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I. Basic Information for CVE-2026-113611

Vulnerability Information
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Vulnerability Title
Outline before 1.8.0 Information Disclosure via Orphaned Webhook Subscriptions
Source: CVE Program / CVE List V5
Vulnerability Description
Outline before 1.8.0 contains an improper access revocation vulnerability that allows deleted administrators to keep receiving document contents because UserDeletedProcessor never disables their WebhookSubscription rows. Former admins who registered webhooks before deletion continue receiving full document bodies, including Markdown and Yjs data, via DeliverWebhookTask for every matching workspace event.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
outline outline 0 ~ 1.8.0 -

II. Public POCs for CVE-2026-113611

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-113611

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Vendor Advisories for CVE-2026-113611 (2)

Vendor Pages for CVE-2026-113611 (1)

IV. Related Vulnerabilities

Same product: outline
Same vendor: outline
Same weakness: CWE-863

V. Comments for CVE-2026-113611

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