CVE-2026-72724 (GCVE-0-2026-72724)
Vulnerability from cvelistv5
Published
2026-08-10 15:59
Modified
2026-08-11 01:57
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-72724",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-11T01:57:32.913192Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-11T01:57:42.639Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "discourse",
"vendor": "discourse",
"versions": [
{
"status": "affected",
"version": "\u003c 2026.1.6"
},
{
"status": "affected",
"version": "\u003e= 2026.5.0-latest, \u003c 2026.5.2"
},
{
"status": "affected",
"version": "\u003e= 2026.6.0-latest, \u003c 2026.6.1"
},
{
"status": "affected",
"version": "\u003e= 2026.7.0-latest, \u003c 2026.7.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-10T15:59:53.965Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48"
},
{
"name": "https://github.com/discourse/discourse/pull/42091",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/pull/42091"
},
{
"name": "https://github.com/discourse/discourse/pull/42092",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/pull/42092"
},
{
"name": "https://github.com/discourse/discourse/pull/42093",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/pull/42093"
},
{
"name": "https://github.com/discourse/discourse/pull/42094",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/pull/42094"
},
{
"name": "https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75"
},
{
"name": "https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c"
},
{
"name": "https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f"
},
{
"name": "https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce"
}
],
"source": {
"advisory": "GHSA-8g98-fvfc-9w48",
"discovery": "UNKNOWN"
},
"title": "Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-72724",
"datePublished": "2026-08-10T15:59:53.965Z",
"dateReserved": "2026-08-10T13:48:09.545Z",
"dateUpdated": "2026-08-11T01:57:42.639Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-639\", \"lang\": \"en\", \"description\": \"CWE-639: Authorization Bypass Through User-Controlled Key\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"NONE\", \"baseScore\": 4.3, \"baseSeverity\": \"MEDIUM\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"scope\": \"UNCHANGED\", \"userInteraction\": \"NONE\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N\", \"version\": \"3.1\"}}], \"references\": [{\"name\": \"https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48\"}, {\"name\": \"https://github.com/discourse/discourse/pull/42091\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/pull/42091\"}, {\"name\": \"https://github.com/discourse/discourse/pull/42092\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/pull/42092\"}, {\"name\": \"https://github.com/discourse/discourse/pull/42093\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/pull/42093\"}, {\"name\": \"https://github.com/discourse/discourse/pull/42094\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/pull/42094\"}, {\"name\": \"https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75\"}, {\"name\": \"https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c\"}, {\"name\": \"https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f\"}, {\"name\": \"https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce\"}], \"affected\": [{\"vendor\": \"discourse\", \"product\": \"discourse\", \"versions\": [{\"version\": \"\u003c 2026.1.6\", \"status\": \"affected\"}, {\"version\": \"\u003e= 2026.5.0-latest, \u003c 2026.5.2\", \"status\": \"affected\"}, {\"version\": \"\u003e= 2026.6.0-latest, \u003c 2026.6.1\", \"status\": \"affected\"}, {\"version\": \"\u003e= 2026.7.0-latest, \u003c 2026.7.0\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-10T15:59:53.965Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.\"}], \"source\": {\"advisory\": \"GHSA-8g98-fvfc-9w48\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-72724\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-11T01:57:32.913192Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-11T01:57:38.770Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-72724\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-08-10T13:48:09.545Z\", \"datePublished\": \"2026-08-10T15:59:53.965Z\", \"dateUpdated\": \"2026-08-11T01:57:42.639Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…