CVE-2026-49256
Discourse: Hidden tag names leaked via category serializers
CVSS Score
0.0
EPSS Score
0.4%
EPSS Percentile
30th
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.
| CWE | CWE-200 |
| Vendor | discourse |
| Product | discourse |
| Published | Jul 9, 2026 |
| Last Updated | Jul 10, 2026 |
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Affected Versions
discourse / discourse
>= 2026.1.0-latest, < 2026.1.5 >= 2026.4.0-latest, < 2026.4.2 >= 2026.5.0-latest, < 2026.5.1
References
github.com: https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx github.com: https://github.com/discourse/discourse/releases/tag/v2026.1.5 github.com: https://github.com/discourse/discourse/releases/tag/v2026.4.2 github.com: https://github.com/discourse/discourse/releases/tag/v2026.5.1 github.com: https://github.com/discourse/discourse/releases/tag/v2026.6.0