Vulnerability · Published Sep 4, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity authorization bypass via user-controlled key in blinko from blinkospace. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 47.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
blinkospace	blinko	0 – through 1.8.8

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Issue #1218 issue-tracking
https://github.com/blinkospace/blinko product
https://github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/message.ts technical-description
https://github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/conversation.ts technical-description
VulnCheck Advisory: Blinko 1.8.7 Cross-User AI Conversation Read and Write via message tRPC Router third-party-advisory