Cross-user calendar writes via unchecked re-parenting
Published Jun 23, 2026 · Updated Jun 23, 2026
Authorization bypass in Open WebUI before 0.9.6 allows remote authenticated users to write events into another user's calendar. The event update endpoint checks write access only to the event's current calendar, while update_event_by_id persists a caller-supplied destination calendar_id without an access check. A regular user-role account can exploit the default-enabled calendar feature after learning a target calendar ID, inserting arbitrary event content but gaining no read access or continued control after the move.
Summary
What happened
Authorization bypass in Open WebUI before 0.9.6 allows remote authenticated users to write events into another user's calendar. The event update endpoint checks write access only to the event's current calendar, while update_event_by_id persists a caller-supplied destination calendar_id without an access check. A regular user-role account can exploit the default-enabled calendar feature after learning a target calendar ID, inserting arbitrary event content but gaining no read access or continued control after the move.
The record
- CVE
- CVE-2026-54006
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Vendor
- Open WebUI
- Product
- Open WebUI
- Classifications
- CWE-639, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 23, 2026CVE publishedPublication date reported by the CVE source.
- Jun 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.9.6
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
- Vendor advisory end-to-end reproductionfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo