CVE-2026-91157
Discourse is an open-source discussion platform
- Risk score
- 58/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 14 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 attac…
- Affected
- See advisory
- Fix
- Upgrade the product to 2026.9.0, 2026.8.1, 2026.7.3 or 2026.1.9 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.5 high
- Remotely exploitable without logging in
References
- https://github.com/discourse/discourse/commit/16017732981fdb3ee65d7b3c69c573610bf02aab
- https://github.com/discourse/discourse/commit/83f5f9f1df7ddc79ec0950e1b2038ba659635708
- https://github.com/discourse/discourse/commit/98f1c021d0e956cded5239a5d8a6afe2b9e1b7e7
- https://github.com/discourse/discourse/commit/b2fb98394b2636b29e850f06b0029f8ca8b48458
- https://github.com/discourse/discourse/security/advisories/GHSA-298h-xgw6-4pv3
Original description
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.
Last activity 14 Oct 2026. Patch Forecast updates every hour.