Is CVE-2026-113611 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-113611 being exploited in the wild.

How severe is CVE-2026-113611?

Medium severity, with a CVSS score of 4.9, published 20 October 2026.

Is there a fix for CVE-2026-113611?

Yes: fixed in Outline 1.8.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-113611 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-113611?

Check whether you run Outline at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-113611: Outline improper access revocation in webhook subscriptions

CVE-2026-113611 · Severity: medium · CVSS 4.9 · Published 2026-10-20

Outline is a collaborative document and wiki platform used by teams to manage knowledge. When an administrator account is deleted, the system fails to disable their webhook subscriptions, allowing the former admin to continue receiving sensitive document contents including internal formatting data. This exposes confidential information to an attacker with a deleted admin account.

Technologies: Outline. Vendors: Outline.

Quick answers

Is CVE-2026-113611 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-113611 being exploited in the wild.
How severe is CVE-2026-113611?: Medium severity, with a CVSS score of 4.9, published 20 October 2026.
Which products and versions are affected?: Outline before 1.8.0.
Is there a fix for CVE-2026-113611?: Yes: fixed in Outline 1.8.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-113611 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-113611?: Check whether you run Outline at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Outline 1.8.0

Technical details

The UserDeletedProcessor fails to clean up WebhookSubscription rows when a user is deleted, allowing former administrators to retain webhook access and receive full document bodies via DeliverWebhookTask. An attacker who previously created webhooks as an admin can continue exfiltrating document content after account deletion. The fix disables webhooks associated with deleted users rather than leaving them active.

Affected products

Outline Outline before 1.8.0

Timeline

2026-10-20: disclosed
2026-10-20: patched

References

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