CVE-2026-84302 (GCVE-0-2026-84302)
Vulnerability from cvelistv5 – Published: 2026-09-24 16:49 – Updated: 2026-09-24 17:04
VLAI
EPSS
VEX
Title
Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables
Summary
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 17:04 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/discourse/discourse/security/a… | x_refsource_CONFIRM |
| https://github.com/discourse/discourse/pull/42091 | x_refsource_MISC |
| https://github.com/discourse/discourse/commit/156… | x_refsource_MISC |
| https://github.com/discourse/discourse/commit/234… | x_refsource_MISC |
| https://github.com/discourse/discourse/commit/38d… | x_refsource_MISC |
| https://github.com/discourse/discourse/commit/b32… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-84302",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-24T17:04:31.550424Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-24T17:04:51.257Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "discourse",
"vendor": "discourse",
"versions": [
{
"status": "affected",
"version": "\u003c 2026.7.0"
},
{
"status": "affected",
"version": "\u003e= 2026.6.0-latest, \u003c 2026.6.1"
},
{
"status": "affected",
"version": "\u003e= 2026.5.0-latest, \u003c 2026.5.2"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.6"
}
]
}
],
"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, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.2,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-24T16:49:56.499Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/discourse/discourse/security/advisories/GHSA-3rx9-fqgh-wfpc",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/discourse/discourse/security/advisories/GHSA-3rx9-fqgh-wfpc"
},
{
"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/commit/1566d04524c01472375944bbf7b198dd09a99427",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/1566d04524c01472375944bbf7b198dd09a99427"
},
{
"name": "https://github.com/discourse/discourse/commit/23488b72a200228e805c4e6d970fbad216d328c5",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/23488b72a200228e805c4e6d970fbad216d328c5"
},
{
"name": "https://github.com/discourse/discourse/commit/38d10c0e5d1b76540d2860455e0290f8e975c9fd",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/38d10c0e5d1b76540d2860455e0290f8e975c9fd"
},
{
"name": "https://github.com/discourse/discourse/commit/b323702d87cd82c327c116d9566477f3c4f9635f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/discourse/discourse/commit/b323702d87cd82c327c116d9566477f3c4f9635f"
}
],
"source": {
"advisory": "GHSA-3rx9-fqgh-wfpc",
"discovery": "UNKNOWN"
},
"title": "Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-84302",
"datePublished": "2026-09-24T16:49:56.499Z",
"dateReserved": "2026-09-01T16:17:43.078Z",
"dateUpdated": "2026-09-24T17:04:51.257Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-84302",
"date": "2026-09-29",
"epss": "0.00238",
"percentile": "0.13324"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "discourse",
"vendor": "discourse",
"versions": [
{
"status": "affected",
"version": "\u003c 2026.7.0"
},
{
"status": "affected",
"version": "\u003e= 2026.6.0-latest, \u003c 2026.6.1"
},
{
"status": "affected",
"version": "\u003e= 2026.5.0-latest, \u003c 2026.5.2"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.6"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"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, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."
}
],
"id": "CVE-2026-84302",
"lastModified": "2026-09-24T18:19:03.923",
"metrics": {
"cvssMetricV31": [
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"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.2,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 0.5,
"impactScore": 3.6,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
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},
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}
],
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"timestamp": "2026-09-24T17:04:31.550424Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-24T17:17:06.793",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/commit/1566d04524c01472375944bbf7b198dd09a99427"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/commit/23488b72a200228e805c4e6d970fbad216d328c5"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/commit/38d10c0e5d1b76540d2860455e0290f8e975c9fd"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/commit/b323702d87cd82c327c116d9566477f3c4f9635f"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/pull/42091"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/discourse/discourse/security/advisories/GHSA-3rx9-fqgh-wfpc"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
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"value": "CWE-862"
}
],
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"type": "Secondary"
}
]
}
},
"vulnrichment": {
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"version": "2.0.3"
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "discourse",
"vendor": "discourse",
"versions": [
{
"status": "affected",
"version": "\u003c 2026.7.0"
},
{
"status": "affected",
"version": "\u003e= 2026.6.0-latest, \u003c 2026.6.1"
},
{
"status": "affected",
"version": "\u003e= 2026.5.0-latest, \u003c 2026.5.2"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.6"
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]
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],
"descriptions": [
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}
],
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.2,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
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"problemTypes": [
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"description": "CWE-862: Missing Authorization",
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},
{
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"x_refsource_MISC"
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],
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"discovery": "UNKNOWN"
},
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}
},
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"state": "PUBLISHED"
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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