CVE-2026-109284: Open WebUI chat fork handler improper authorization flaw
Open WebUI
Open WebUI suffered from an improper authorization vulnerability in the chat fork handler allowing forked chats to be placed into folders without write access. Downgraded shared folder members could insert attacker-controlled chats visible to folder owners.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- CVSS
- 5.3
- EPSS
- <0.01 · top 89% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 12 Oct 2026
- last update
- 12 Oct 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-10-12CVE-2026-109284: Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places…NVD · nvd.nist.gov/vuln/detail/CVE-2026-109284
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerability
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- no technique for these categories
- dates
- happened 12 Oct 2026 · first reported 12 Oct 2026
- origin
- NVDVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
Copy a brief
This record as a short Markdown brief, for a ticket, a chat or a coding agent.
the brief as text
# CVE-2026-109284: Open WebUI chat fork handler improper authorization flaw https://gcdradar.vercel.app/incidents/cve-2026-109284-open-webui-chat-fork-handler-improper-author · AIR-2026-0300 · closed 2026-10-12 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-10-12 - AI role: Attack on AI - Products: Open WebUI - CVE ids: CVE-2026-109284 - CVSS: 5.3 ## Summary Open WebUI suffered from an improper authorization vulnerability in the chat fork handler allowing forked chats to be placed into folders without write access. Downgraded shared folder members could insert attacker-controlled chats visible to folder owners. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-10-12: CVE-2026-109284: Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places… (https://nvd.nist.gov/vuln/detail/CVE-2026-109284) ## Sources - 2026-10-12 NVD: CVE-2026-109284: Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places… https://nvd.nist.gov/vuln/detail/CVE-2026-109284 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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AI