High
Discourse: Media uploads remain publicly accessible after category permissions are restricted
Type: advisorySources: OSV
Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, sites with secure uploads enabled did not reconcile existing upload security metadata when a previously public category became read-restricted or when category permissions changed during a bulk import. Media and attachments uploaded while the category was public retained a public accessibility flag and remained reachable by anonymous users through their short upload URLs, including uploads associated with deleted topics. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-91157
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 15:07 UTC · Revision 1
Source evidence
Discourse: Media uploads remain publicly accessible after category permissions are restricted
core-osv · Original sourcePublished 14 Oct 2026, 15:37 UTC
Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, sites with secure uploads enabled did not reconcile existing upload security metadata when a previously public category became read-restricted or when category permissions changed during a bulk import. Media and attachments uploaded while the category was public retained a public accessibility flag and remained reachable by anonymous users through their short upload URLs, including uploads associated with deleted topics. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.
osv:CVE-2026-91157
Complete source record
{
"id": "3842723c789a3c8bfcfbf3ee914f95f76463b5efde8803d1ebdd3a0d8c307250",
"url": "https://osv.dev/vulnerability/CVE-2026-91157",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Discourse: Media uploads remain publicly accessible after category permissions are restricted",
"summary": "Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, sites with secure uploads enabled did not reconcile existing upload security metadata when a previously public category became read-restricted or when category permissions changed during a bulk import. Media and attachments uploaded while the category was public retained a public accessibility flag and remained reachable by anonymous users through their short upload URLs, including uploads associated with deleted topics. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.",
"evidence": "osv:CVE-2026-91157",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-91157",
"aliases": [
"BIT-discourse-2026-91157",
"CVE-2026-91157",
"GHSA-298h-xgw6-4pv3"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
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"repo": "https://github.com/discourse/discourse",
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],
"modified": "2026-10-28T02:30:36.657616289Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91157.json",
"https://github.com/discourse/discourse/security/advisories/GHSA-298h-xgw6-4pv3",
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},
"related_cves": [
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"value": "CVE-2026-91157",
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 503988,
"published_at": "2026-10-14T15:37:02.24+00:00"
}