---
cve: "CVE-2026-65645"
severity: "LOW"
cvss: 3.1
epss: "5.1%"
vendor: "Rocket.Chat"
kev: false
exploited: false
published: "2026-08-21 04:18:14"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T04:53:24+02:00"
---

# CVE-2026-65645

> 3.1 LOW · 🧪 PoC

## Beschreibung

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

## Patch verfügbar (OSV)

- dd2f20f9087383fdeb43590ecf4a01127b588e57 (Commit)
- 620394519991542b13db82e361dcb0c3e2014c1e (Commit)

## Referenzen

- <https://hackerone.com/reports/3852135>
- <https://github.com/RocketChat/Rocket.Chat/pull/41814>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-65645) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_