# CVE-2026-48616: Rocket.Chat improper access control in Livechat file downloads

Source: https://junglewise.ai/threats/cve-2026-48616-rocket-chat-improper-access-control-in-livechat-file-downloads  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-48616 · Severity: critical · CVSS 9.3 · Published 2026-06-17

Rocket.Chat, a popular communication and collaboration platform, contains a security flaw in how it handles file attachments in its Livechat feature. This vulnerability allows unauthorized individuals to bypass security checks and download private files uploaded by users. Because the file identifiers are predictable, an attacker could systematically discover and steal sensitive documents or data shared within the platform without needing a valid account.

Technologies: [Rocket.Chat](https://junglewise.ai/threats/technologies/rocket-chat). Vendors: [Rocket.Chat](https://junglewise.ai/threats/vendors/rocket-chat).

## Quick answers

**Is CVE-2026-48616 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48616 being exploited in the wild.

**How severe is CVE-2026-48616?** Critical severity, with a CVSS score of 9.3, published 17 June 2026.

**Which products and versions are affected?** Rocket.Chat < 7.10.13, 7.13.0 to < 7.13.9, 8.0.0 to < 8.0.7, 8.1.0 to < 8.1.6, 8.2.0 to < 8.2.6, 8.3.0 to < 8.3.6, 8.4.0 to < 8.4.4, 8.5.0 to < 8.5.1.

**Is there a fix for CVE-2026-48616?** A patch was published on 2026-06-11: Fix merged into develop branch via PR 40889 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-48616 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-48616?** Check whether you run Rocket.Chat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper access control vulnerability exists in Rocket.Chat's Livechat file handling at the /file-upload/:fileId/:name endpoint. While the system attempts to authorize downloads using room type and token parameters (rc_room_type=l, rc_rid, and rc_token), it fails to verify that the provided room ID (rc_rid) actually matches the room associated with the requested file. Additionally, the :fileId parameter utilizes predictable sequential MongoDB IDs, and the :name parameter is not validated. This combination allows a remote, unauthenticated attacker to iterate through file IDs and download all uploaded files across the instance. The issue is resolved in versions 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.13.9, and 7.10.13.

## Affected products

- Rocket.Chat Rocket.Chat < 7.10.13, 7.13.0 to < 7.13.9, 8.0.0 to < 8.0.7, 8.1.0 to < 8.1.6, 8.2.0 to < 8.2.6, 8.3.0 to < 8.3.6, 8.4.0 to < 8.4.4, 8.5.0 to < 8.5.1

## Timeline

- 2026-06-11: patched: Fix merged into develop branch via PR 40889
- 2026-06-17: disclosed: Initial disclosure via HackerOne/NVD

## References

- [https://github.com/RocketChat/Rocket.Chat/pull/40889](https://github.com/RocketChat/Rocket.Chat/pull/40889)
- [https://hackerone.com/reports/3687142](https://hackerone.com/reports/3687142)

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