🚨 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
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GitHub
fix: imported fixes 08-18-2026 by julio-rocketchat · Pull Request #41814 · RocketChat/Rocket.Chat
Proposed changes (including videos or screenshots)
Approvals have already been added to the private PRs.
Issue(s)
https://github.com/RocketChat/Rocket.Chat-private-security-fork/pull/853
https://gi...
September 4, 2026 40 1
