What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-23
• Weakness: CWE-863

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.

Affected products

• outline: before 1.8.0 — fixed in 1.8.0

How to fix

Upgrade to a fixed version: outline 1.8.0. Check the vendor advisory for mitigations.

References

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

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