CVE-2026-91157 json
Discourse: Media uploads remain publicly accessible after category permissions are restricted
published 2026-10-14 26 d ago modified 2026-10-21 19 d ago also BIT-discourse-2026-91157 , EUVD-2026-101302 , GHSA-298h-xgw6-4pv3
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
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.
Patch / fix
- bitnami discourse 2026.1.9, 2026.7.3, 2026.8.1, 2026.9.0
- discourse discourse 2026.1.9, 2026.7.3, 2026.8.1, 2026.9.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 20 d ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <2026.1.9 >=2026.7.0, <2026.7.3 >=2026.8.0, <2026.8.1 >=2026.8.99, <2026.9.0 |
2026.1.9 2026.7.3 2026.8.1 2026.9.0 |
Affected products
- discourse discourse
Classification
References
-
github.com
/discourse/discourse/commit/16017732981fdb3ee65d7b3c69c573610bf02aab
web
-
github.com
/discourse/discourse/commit/83f5f9f1df7ddc79ec0950e1b2038ba659635708
web
-
github.com
/discourse/discourse/commit/98f1c021d0e956cded5239a5d8a6afe2b9e1b7e7
web
-
github.com
/discourse/discourse/commit/b2fb98394b2636b29e850f06b0029f8ca8b48458
web
-
github.com
/discourse/discourse/security/advisories/GHSA-298h-xgw6-4pv3
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-91157
web
Sources
- CVE List CVE-2026-91157
- NVD CVE-2026-91157
- OSV BIT-discourse-2026-91157
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.