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CVE-2026-45316

Open WebUI: Read-Only Users Can Toggle Note Pin Status via Incorrect Permission Check (Write via Read-Only Access)

Published: May 15, 2026Updated: May 18, 2026 Sources: CVE List NVD BDUCWE-863
NVD MITRE
3.5CVSSLOW
EPSS Score
0.2%
Top 88.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

open webuiopenwebui
On-premWeb App
AI / ML / ai-agent-tooling
Open WebUIСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
open-webuiopen-webui
On-premWeb App
AI / ML / ai-agent-tooling
openwebuioss-projectAI / MLaka open webui
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
open-webuioss-projectAI / MLaka open-webui/open-webui, open-webui

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j
github.com

Timeline

Published
May 15, 2026
Last Updated
May 18, 2026

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