Auth bypass in Rocket.chat
CVE-2026-48929
Rocket.Chat 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 is vulnerable to unauthenticated file deletion. The deleteFileMessage Meteor method permanently deletes any uploaded file by ID without requiring authentication. When called via an unauthenticated DDP WebSocket connection, Meteor.userId() returns null, causing the authorization check to be skipped. Execution falls through to FileUpload.getStore('Uploads').deleteById(fileID), which removes the file from storage and database unconditionally. File IDs are discoverable from public channel message payloads and download URLs.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.001
Affected products
- Rocket.chat — versions 0
Weakness classification (CWE)
References
- hackerone.com/reports/3611837 (Third Party Advisory)
- github.com/RocketChat/Rocket.Chat/pull/40889/ (Patch, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2026-48929?
- CVE-2026-48929 is a high-severity vulnerability in Rocket.chat, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-06-17.
- How severe is CVE-2026-48929?
- High severity. CVSS v3 base score is 7.5 out of 10.