CVE-2026-49256
High
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Discourse
PublishedJul 9, 2026
First seenJul 9, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- discourse discourse2026.1.5, 2026.4.2, 2026.5.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| discourse discourse | 2026.1.0 ≤ v < 2026.1.5, 2026.4.0 ≤ v < 2026.4.2, 2026.5.0 ≤ v < 2026.5.1, 2026.6.0 | 2026.1.5, 2026.4.2, 2026.5.1 |
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