CVE-2026-45351: Open WebUI System Prompt Exposure to Non-Admin Users
Open WebUI
An API response flaw in Open WebUI allows regular non-admin users to view model system prompts set by administrators. This compromises confidentiality by exposing confidential prompt instructions.
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
- 6.5
- EPSS
- <0.01 · top 80% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 14 May 2026
- last update
- 15 May 2026
- CVE ids
Timeline · 2
Sources · 2
Advisories and databases
- 2026-05-14CVE-2026-45351: Open WebUI Exposes System Prompt to Regular User [Non-Admin]GitHub Advisory Database · github.com/advisories/GHSA-jh9g-8jqw-m2qx
- 2026-05-15CVE-2026-45351: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline.NVD · nvd.nist.gov/vuln/detail/CVE-2026-45351
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 vulnerabilityData leak
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- mitre atlas
- no technique for these categories
- dates
- happened 14 May 2026 · first reported 14 May 2026
- origin
- GitHub Advisory DatabaseVulnerability 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 07:00Z · updated 2026-10-18 10:04Z
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-2026-45351: Open WebUI System Prompt Exposure to Non-Admin Users https://gcdradar.vercel.app/incidents/cve-2026-45351-open-webui-system-prompt-exposure-to-non-admi · AIR-2026-0705 · closed 2026-05-14 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-05-14 - AI role: Attack on AI - Products: Open WebUI - CVE ids: CVE-2026-45351 - CVSS: 6.5 ## Summary An API response flaw in Open WebUI allows regular non-admin users to view model system prompts set by administrators. This compromises confidentiality by exposing confidential prompt instructions. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-05-15: CVE-2026-45351: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-45351) - 2026-05-14: CVE-2026-45351: Open WebUI Exposes System Prompt to Regular User [Non-Admin] (https://github.com/advisories/GHSA-jh9g-8jqw-m2qx) ## Sources - 2026-05-14 GitHub Advisory Database: CVE-2026-45351: Open WebUI Exposes System Prompt to Regular User [Non-Admin] https://github.com/advisories/GHSA-jh9g-8jqw-m2qx - 2026-05-15 NVD: CVE-2026-45351: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-45351 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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Patch now · Disclosed · since 14 May 2026 · updated 15 May 2026 · CVE-2026-45387
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Patch now · Disclosed · since 12 Oct 2026 · CVE-2026-109293
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AI