Discourse: Escape LIKE metacharacters in upload paths to prevent disclosure
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| discourse | discourse | before 2026.8.0; 2026.7.0-latest to before 2026.7.2; 2026.6.0-latest to before 2026.6.3; 2026.1.0-latest to before 2026.1.8 | 2026.8.0, 2026.7.2, 2026.6.3, 2026.1.8 | Patch available | CNA |
- discourse Vendordiscourse Affected before 2026.8.0; 2026.7.0-latest to before 2026.7.2; 2026.6.0-latest to before 2026.6.3; 2026.1.0-latest to before 2026.1.8 Fixed in 2026.8.0, 2026.7.2, 2026.6.3, 2026.1.8 Patch available CNA
Remediation
- Fix · CNA discourse (discourse) Fixed in 2026.8.0, 2026.7.2, 2026.6.3, 2026.1.8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-91133
References
Other 6
- https://github.com/discourse/discourse/security/advisories/GHSA-8hxh-573g-52gx
- https://github.com/discourse/discourse/pull/42882
- https://github.com/discourse/discourse/commit/113c34d433d564bc69642649d501251a7e820b52
- https://github.com/discourse/discourse/commit/20c48bef712ee3edd4f7af58ca1123cb0c16ef6f
- https://github.com/discourse/discourse/commit/a04cab107a9f57939456181c4b082d0a34ec39bd
- https://github.com/discourse/discourse/commit/cb3ca8420fcc7aba334effd011cf41943a336fa6
More discourse vulnerabilities
- TI-2022-22806 Discourse BBCode plugin vulnerable to arbitrary CSS injection CVSS 3.1CRITICAL 9.8
- TI-2021-19656 Denial of Service in discourse CVSS 3.1MEDIUM 6.8
- TI-2024-36150 Potential Backup file leaked via Nginx in Discourse CVSS 3.1HIGH 7.5
- TI-2021-18002 RCE via malicious SNS subscription payload CVSS 3.1CRITICAL 10.0
- TI-2026-24651 Discourse: Open redirect via `sso_destination_url` cookie in `enter` CVSS 4.0MEDIUM 5.1
- TI-2022-18730 Discourse Patreon vulnerable to improper validation of email during Patreon authentication CVSS 3.1CRITICAL 9.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences