CVE-2026-65645 Missing authorization in Rocket.Chat
Low-privilege users can access private thread data in Rocket.Chat due to missing input validation in DDP methods.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65645?
CVE-2026-65645 is a medium-severity missing authorization vulnerability in Rocket.chat Rocket.chat, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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
Weakness: CWE-20
Which versions are affected by CVE-2026-65645?
It affects 1 product.
Products include Rocket.chat Rocket.chat.
How do I fix CVE-2026-65645?
No fix has been published for CVE-2026-65645 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-65645 being exploited?
There is no known exploitation of CVE-2026-65645 in the wild and no public exploit code.
Other vulnerabilities in Rocket.chat Rocket.chat
Sources
Also known as GHSA-gw74-gwm4-8crp.