Vulnerability in Rocket.chat
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. 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Rocket.chat — versions 0
Weakness classification (CWE)
References
- hackerone.com/reports/3687142 (Third Party Advisory)
- github.com/RocketChat/Rocket.Chat/pull/40889 (Patch, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2026-48616?
- CVE-2026-48616 is a critical-severity vulnerability in Rocket.chat, classified under Improper Access Control. CVSS score: 9.3/10. Published 2026-06-17.
- How severe is CVE-2026-48616?
- Critical severity. CVSS v3 base score is 9.3 out of 10.