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

> Authenticated users can read, modify, or delete other users' AI chat conversations due to missing ownership checks in tRPC procedures.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-2rx6-45h4-gf4q

## What is CVE-2026-85607?

CVE-2026-85607 is a high-severity missing authorization vulnerability in blinkospace blinko, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-85607?


## How do I fix CVE-2026-85607?

No fix has been published for CVE-2026-85607 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85607 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85607 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85607 and fix it if it is affected.

What it is: CVE-2026-85607 is a high-severity missing authorization vulnerability in blinkospace blinko, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85607 exists.

Affected product: blinkospace blinko. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85607/ (Markdown: https://insights.sbomify.com/CVE-2026-85607/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85607
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85607
- OSV: https://osv.dev/vulnerability/CVE-2026-85607

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85607/
Summaries are generated and may contain mistakes; the official description above is the record.