Authenticated metadata disclosure via null-collection event filtering
Published Mar 17, 2026 · Updated Mar 17, 2026
Information disclosure in Outline before 1.5.0 allows remote authenticated users to read private-document metadata via events.list. The server/routes/api/events/events.ts query treats every event with a null collectionId as global without checking actorId or document ownership, exposing events for private drafts and deleted documents. Any regular member can obtain document IDs, activity timestamps, and some permanently deleted document titles, but not document content directly.
Summary
What happened
Information disclosure in Outline before 1.5.0 allows remote authenticated users to read private-document metadata via events.list. The server/routes/api/events/events.ts query treats every event with a null collectionId as global without checking actorId or document ownership, exposing events for private drafts and deleted documents. Any regular member can obtain document IDs, activity timestamps, and some permanently deleted document titles, but not document content directly.
The record
- CVE
- CVE-2026-28506
- Published
- Mar 17, 2026
- Updated
- Mar 17, 2026
- Vendor
- Outline
- Product
- Outline
- Classifications
- CWE-200, T1213
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 17, 2026CVE publishedPublication date reported by the CVE source.
- Mar 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Authenticated events.list request proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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