Auth bypass in Blinkospace Blinko
CVE-2026-85607
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/blinkospace/blinko (product)
- github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/conversation.ts (technical-description)
- github.com/blinkospace/blinko/blob/1.8.8/server/routerTrpc/message.ts (technical-description)
- github.com/blinkospace/blinko/issues/1218 (issue-tracking)
- www.vulncheck.com/advisories/blinko-1.8.7-cross-user-ai-conversation-read-and-w… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85607?
- CVE-2026-85607 is a high-severity vulnerability in Blinkospace Blinko, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2026-09-04.
- How severe is CVE-2026-85607?
- High severity. CVSS v3 base score is 8.8 out of 10.