CVE-2026-91157Discourse: Media uploads remain publicly accessible after category permissions are restricted
Updated under an hour ago ()
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It affects discourse. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.48%, higher than 40% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-200, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.48% (percentile 40)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
discourse discourse discourse:discourse (from the name) | before 2026.1.9; from 2026.7.0-latest, < 2026.7.3; from 2026.8.0-latest, < 2026.8.1; from 2026.9.0-latest, < 2026.9.0 | CNA record |
References
- https://github.com/discourse/discourse/security/advisories/GHSA-298h-xgw6-4pv3x-refsource-confirm
- https://github.com/discourse/discourse/commit/16017732981fdb3ee65d7b3c69c573610bf02aabx-refsource-misc
- https://github.com/discourse/discourse/commit/83f5f9f1df7ddc79ec0950e1b2038ba659635708x-refsource-misc
- https://github.com/discourse/discourse/commit/98f1c021d0e956cded5239a5d8a6afe2b9e1b7e7x-refsource-misc
- https://github.com/discourse/discourse/commit/b2fb98394b2636b29e850f06b0029f8ca8b48458x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.