Medium
Security advisory
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. {"$gt": "4"}) can be substituted for a string room-id or message-id. The authorization check resolves to a room the attacker already has access to, while the downstream data query fans out across all rooms - disclosing private thread parents and their full reply content to any low-privilege authenticated user. The REST route chat.getThreadsList was patched in v5.0 (HackerOne report #1446767) by adding rid: {type:'string'} AJV validation. The equivalent DDP method was never given the same fix and remains exploitable
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-65645
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 19:54 UTC · Revision 1
Source evidence
Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6. 8.3.8, 8.2.8, 8.1.8, and 7.10.15, the Meteor DDP methods getThreadsList and getThreadMessages accept rid / tmid as raw, untyped parameters with no schema validation. A MongoDB operator object (e.g. {"$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
osv:CVE-2026-65645
Complete source record
{
"id": "6bb892b23097ad186592bd2b6a559be6d903ff76c43992826de36a9e9925bd2a",
"url": "https://osv.dev/vulnerability/CVE-2026-65645",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-65645",
"summary": "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",
"evidence": "osv:CVE-2026-65645",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-65645",
"aliases": [
"CVE-2026-65645"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
}
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"modified": "2026-10-28T02:30:23.058647858Z",
"provider": "osv",
"references": [
"https://hackerone.com/reports/3852135",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65645.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-65645",
"https://github.com/RocketChat/Rocket.Chat/pull/41814"
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"evidence": "/id"
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},
"source_id": "core-osv",
"document_id": 489455,
"published_at": "2026-08-21T02:53:43.305+00:00"
}