CVE-2026-49256
6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| discourse | discourse | >= 2026.1.0-latest, < 2026.1.5 | affected |
| discourse | discourse | >= 2026.4.0-latest, < 2026.4.2 | affected |
| discourse | discourse | >= 2026.5.0-latest, < 2026.5.1 | affected |
Weaknesses
- CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
References
- https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx
- https://github.com/discourse/discourse/releases/tag/v2026.1.5
- https://github.com/discourse/discourse/releases/tag/v2026.4.2
- https://github.com/discourse/discourse/releases/tag/v2026.5.1
- https://github.com/discourse/discourse/releases/tag/v2026.6.0
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