CVE-2026-113611 — Outline before 1.8.0 Information Disclosure via Orphaned Webhook Subscriptions
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Outline Outline).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 6.9 | CVSS 4.0 | Medium | — | — | disclosure@vulncheck.com via NIST National Vulnerability Database |
| 6.9 | CVSS 4.0 | Medium | — | — | VulnCheck via CVE Program (cve.org) e CISA ADP |
| 4.9 | CVSS 3.1 | Medium | 1.2 | 3.6 | disclosure@vulncheck.com via NIST National Vulnerability Database |
| 4.9 | CVSS 3.1 | Medium | — | — | VulnCheck via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N (score shown at the top: disclosure@vulncheck.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Audit administrative actions and access to resources outside each user’s normal pattern.
Timeline
What happened to this CVE, newest first.
- 2026
- Source status changed · Received → Awaiting Analysis
- Affected products added · outline/outline
- Record published
- CVSS changed · 4.9
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× References added · Oct 20, 2026 – Oct 20, 2026
- 1× Official description updated · Oct 20, 2026 – Oct 20, 2026
References
5 on the record
- github.com/outline/outline/commit/e044014cea958962fc9f5e2b8f6ff1d8cadd676f
- github.com/outline/outline/security/advisories/GHSA-33jq-x32c-3ccw
- github.com/outline/outline/releases/tag/v1.8.0
- www.vulncheck.com/advisories/outline-before-1.8.0-information-disclosure-via-orphaned-w
- github.com/outline/outline/blob/v1.7.1/server/queues/processors/UserDeletedProce
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-54573 Authorization Bypass in API Key/OAuth Scopes via Path Parsing Discrepancy Jun 25, 2026
- Medium CVE-2026-44695 Outline: Slack OAuth state can link a victim Outline account to an attacker Slack identity May 11, 2026
- High CVE-2026-43886 Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access May 11, 2026
- High CVE-2026-43887 Outline: Stored XSS via Comment Mentions May 11, 2026
- High CVE-2026-43890 Outline: IDOR in subscriptions.create allows cross-tenant subscription on private documents (sibling of GHSA-23jj-rp48-w7q7) May 11, 2026
- High CVE-2026-43888 Outline: Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import May 11, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-113611 is "Outline before 1.8.0 Information Disclosure via Orphaned Webhook Subscriptions", rated Medium. It affects Outline (Outline); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.9 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
Comments
Moderated technical discussion. Read the community guidelines.
No comments yet.
Sign in or create an account to comment and suggest corrections.