CVE-2026-113611

MEDIUM 4.9

Outline before 1.8.0 Information Disclosure via Orphaned Webhook Subscriptions

CVSS Score

4.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	outline
Product	outline
Published	Oct 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

outline / outline

0 < 1.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/outline/outline/security/advisories/GHSA-33jq-x32c-3ccw github.com: https://github.com/outline/outline/commit/e044014cea958962fc9f5e2b8f6ff1d8cadd676f github.com: https://github.com/outline/outline/releases/tag/v1.8.0 github.com: https://github.com/outline/outline/blob/v1.7.1/server/queues/processors/UserDeletedProcessor.ts vulncheck.com: https://www.vulncheck.com/advisories/outline-before-1.8.0-information-disclosure-via-orphaned-webhook-subscriptions

Credits

Sanjorn Keeratirungsan (dizconnectz)