Rocket.Chat Rocket.Chat
CVE-2026-65645
Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6. 8.3.8, 8.2.8, 8.1.8, and 7.10.15, the Meteor DDP methods getThreadsList and getThreadMessages accept rid / tmid as raw, untyped parameters with no schema validation. A MongoDB operator object (e.g. {"$gt": "4"}) can be substituted for a string room-id or message-id. The authorization check resolves to a room the attacker already has access to, while the downstream data query fans out across all rooms - disclosing private thread parents and their full reply content to any low-privilege authenticated user. The REST route chat.getThreadsList was patched in v5.0 (HackerOne report #1446767) by adding rid: {type:'string'} AJV validation. The equivalent DDP method was never given the same fix and remains exploitable
What this means for your business
- It affects Rocket.Chat. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, with an ordinary user login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.2% chance of attack attempts being seen in the next 30 days, ranking above 10% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Rocket.Chat, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Fastnexa security experts
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Scoring
- CVSS
- 4.3 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N- Weakness
- CWE-20
- Assigned by
- support@hackerone.com
Dates
- Published
- 2026-08-21
- Last modified
- 2026-09-04
- Sources
- NVD
Affected products
- Rocket.Chat Rocket.Chat- 7.10.15, 8.1.0 - 8.1.8, 8.2.0 - 8.2.8, 8.3.0 - 8.3.8, 8.4.0 - 8.4.6, 8.5.0 - 8.5.3, 8.6.0 - 8.6.2, 8.7.0
As listed in the NVD configuration data. Not a statement about your estate.