What’s Vulnerable › Vulnerabilities

CVE-2026-91133: Discourse: Escape LIKE metacharacters in upload paths to prevent disclosure

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-24
• Weakness: CWE-943

Description

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.

Affected products

• discourse: before 2026.8.0; from 2026.7.0-latest, < 2026.7.2; from 2026.6.0-latest, < 2026.6.3; from 2026.1.0-latest, < 2026.1.8

References

• 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
• https://github.com/discourse/discourse/pull/42882
• https://github.com/discourse/discourse/security/advisories/GHSA-8hxh-573g-52gx

Get alerted when CVE-2026-91133 or the next vulnerability affects your stack