Discourse: Media uploads remain publicly accessible after category permissions are restricted
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.
CVE-2026-91157
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-91157
discourse
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "discourse",
"product": "discourse",
"versions": [
{
"status": "affected",
"version": "< 2026.1.9"
},
{
"status": "affected",
"version": ">= 2026.7.0-latest, < 2026.7.3"
},
{
"status": "affected",
"version": ">= 2026.8.0-latest, < 2026.8.1"
},
{
"status": "affected",
"version": ">= 2026.9.0-latest, < 2026.9.0"
}
]
}
]- Related CVEs
- CVE-2026-91157
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #42062 · Revision 1
- Added to Heist Feed
- Publisher date