CVE-2026-109284 (GCVE-0-2026-109284)
Vulnerability from cvelistv5 – Published: 2026-10-12 16:04 – Updated: 2026-10-13 16:55
VLAI
EPSS
VEX
Title
Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint
Summary
Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places forked chats in the source chat's folder without checking folder write access. Shared folder members downgraded to read-only can call POST /api/v1/chats/{id}/fork on chats they created there while they had write access, inserting attacker-controlled chats visible to the folder owner and members.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 15:49 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | vendor-advisory |
| https://www.vulncheck.com/advisories/open-webui-0… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| open-webui | open-webui |
Affected:
0.11.0 , < 0.11.4
(semver)
Unaffected: 0.11.4 (semver) cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* |
Date Public
2026-09-27 00:00
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