---
id: "CVE-2026-119664"
kind: "vulnerability"
aliases: ["CVE-2026-119664"]
title: "Tamery: authenticated users can write messages into other users' AI chat history"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-chat", "ai-tooling", "cloud-sync", "tamery"]
not_affected_if: ["no-cloud-sync", "version-0.99.0-or-later"]
published_at: "2026-10-30T15:16:50+00:00"
first_seen_at: "2026-10-30T15:31:11+00:00"
updated_at: "2026-10-30T15:33:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119664", "first_seen_at": "2026-10-30T15:31:11+00:00"}]
---

# Tamery: authenticated users can write messages into other users' AI chat history

Tamery (formerly Conar) versions 0.26.1 before 0.99.0 have an authorization flaw in the cloud sync chatsMessages.update handler, which accepts a client-supplied chatId without checking ownership. An authenticated Pro subscriber who knows another user's chat ID can insert messages with arbitrary parts and metadata into the victim's AI chat history.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Tamery version; affected versions are 0.26.1 up to but not including `0.99.0`.
- Review whether your team runs or relies on Tamery's cloud sync feature.

## Fix

- Tamery: move to `0.99.0` or later, per the affected range stated in the source.

## Timeline

- 2026-10-30T15:31:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119664

## From the sources

Tamery (formerly Conar) 0.26.1 before 0.99.0 contains an authorization bypass vulnerability in the cloud sync API chatsMessages.update handler, which leaves the client-supplied chatId writable. Authenticated Pro subscribers who know another user's chat ID can move messages with arbitrary parts and metadata into the victim's AI chat history.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_