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
{
"cna_assigner": "hackerone",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65645.json"
}{
"cpe": [
"cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*",
"cpe:2.3:a:rocket.chat:rocket.chat:8.7.0:*:*:*:*:*:*:*"
],
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "7.10.15"
},
{
"introduced": "8.1.0"
},
{
"fixed": "8.1.8"
},
{
"introduced": "8.2.0"
},
{
"fixed": "8.2.8"
},
{
"introduced": "8.3.0"
},
{
"fixed": "8.3.8"
},
{
"introduced": "8.4.0"
},
{
"fixed": "8.4.6"
},
{
"introduced": "8.5.0"
},
{
"fixed": "8.5.3"
},
{
"introduced": "8.6.0"
},
{
"fixed": "8.6.2"
},
{
"introduced": "8.7.0"
},
{
"last_affected": "8.7.0"
}
],
"source": [
"CPE_RANGE",
"CPE_STRING"
]
}