Vulnerability in Discourse
CVE-2026-91133
Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, authenticated users could supply unescaped SQL LIKE metacharacters to upload-resolution patterns, causing wildcard input to select unrelated upload records instead of matching a literal identifier. The affected upload metadata, URL-lookup, and cooked-video-placeholder paths could resolve uploads the user was not authorized to access. This allowed disclosure of restricted metadata, including original filenames and secure-upload paths, without modifying the upload records. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Discourse — versions < 2026.8.0, >= 2026.1.0-latest, < 2026.1.8, >= 2026.6.0-latest, < 2026.6.3
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-8hxh-573g-52gx
- github.com/discourse/discourse/pull/42882
- github.com/discourse/discourse/commit/113c34d433d564bc69642649d501251a7e820b52
- github.com/discourse/discourse/commit/20c48bef712ee3edd4f7af58ca1123cb0c16ef6f
- github.com/discourse/discourse/commit/a04cab107a9f57939456181c4b082d0a34ec39bd
- github.com/discourse/discourse/commit/cb3ca8420fcc7aba334effd011cf41943a336fa6
Frequently asked questions
- What is CVE-2026-91133?
- CVE-2026-91133 is a medium-severity vulnerability in Discourse, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 6.5/10. Published 2026-09-24.
- How severe is CVE-2026-91133?
- Medium severity. CVSS v3 base score is 6.5 out of 10.